diff --git a/ICSharpCode.ILSpyX/AssemblyListManager.cs b/ICSharpCode.ILSpyX/AssemblyListManager.cs
index 83f264f6d..8a886df5f 100644
--- a/ICSharpCode.ILSpyX/AssemblyListManager.cs
+++ b/ICSharpCode.ILSpyX/AssemblyListManager.cs
@@ -56,6 +56,7 @@ namespace ICSharpCode.ILSpyX
 		}
 
 		public bool ApplyWinRTProjections { get; set; }
+
 		public bool UseDebugSymbols { get; set; }
 
 		public ObservableCollection<string> AssemblyLists { get; } = new ObservableCollection<string>();
diff --git a/ILSpy.ReadyToRun/ReadyToRunLanguage.cs b/ILSpy.ReadyToRun/ReadyToRunLanguage.cs
index 410e49b67..b201a6608 100644
--- a/ILSpy.ReadyToRun/ReadyToRunLanguage.cs
+++ b/ILSpy.ReadyToRun/ReadyToRunLanguage.cs
@@ -33,6 +33,7 @@ using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.Decompiler.Solution;
 using ICSharpCode.Decompiler.TypeSystem;
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpyX;
 
 using ILCompiler.Reflection.ReadyToRun;
@@ -174,7 +175,7 @@ namespace ICSharpCode.ILSpy.ReadyToRun
 							.GroupBy(m => m.MethodHandle)
 							.ToDictionary(g => g.Key, g => g.ToArray());
 				}
-				var displaySettings = MainWindow.Instance.CurrentDisplaySettings;
+				var displaySettings = SettingsService.Instance.DisplaySettings;
 				bool showMetadataTokens = displaySettings.ShowMetadataTokens;
 				bool showMetadataTokensInBase10 = displaySettings.ShowMetadataTokensInBase10;
 #if STRESS
diff --git a/ILSpy/App.xaml.cs b/ILSpy/App.xaml.cs
index d0b08f0f5..c136891a1 100644
--- a/ILSpy/App.xaml.cs
+++ b/ILSpy/App.xaml.cs
@@ -201,7 +201,8 @@ namespace ICSharpCode.ILSpy
 		protected override void OnStartup(StartupEventArgs e)
 		{
 			var output = new StringBuilder();
-			if (ILSpy.MainWindow.FormatExceptions(StartupExceptions.ToArray(), output))
+
+			if (StartupExceptions.FormatExceptions(output))
 			{
 				MessageBox.Show(output.ToString(), "Sorry we crashed!");
 				Environment.Exit(1);
diff --git a/ILSpy/ExtensionMethods.cs b/ILSpy/ExtensionMethods.cs
index 68c604a0d..374ad026e 100644
--- a/ILSpy/ExtensionMethods.cs
+++ b/ILSpy/ExtensionMethods.cs
@@ -20,12 +20,14 @@
 
 using System;
 using System.Collections.Generic;
+using System.Text;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Media;
 
 using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.Decompiler.TypeSystem;
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpyX;
 
 namespace ICSharpCode.ILSpy
@@ -75,7 +77,7 @@ namespace ICSharpCode.ILSpy
 		public static ICompilation? GetTypeSystemWithCurrentOptionsOrNull(this MetadataFile file)
 		{
 			return LoadedAssemblyExtensions.GetLoadedAssembly(file)
-				.GetTypeSystemOrNull(DecompilerTypeSystem.GetOptions(MainWindow.Instance.CurrentDecompilerSettings));
+				.GetTypeSystemOrNull(DecompilerTypeSystem.GetOptions(SettingsService.Instance.DecompilerSettings));
 		}
 
 		#region DPI independence
@@ -162,5 +164,34 @@ namespace ICSharpCode.ILSpy
 		{
 			return color?.R * 0.3 + color?.G * 0.6 + color?.B * 0.1 ?? 0.0;
 		}
+
+		internal static bool FormatExceptions(this IList<App.ExceptionData> exceptions, StringBuilder output)
+		{
+			if (exceptions.Count == 0)
+				return false;
+			bool first = true;
+
+			foreach (var item in exceptions)
+			{
+				if (first)
+					first = false;
+				else
+					output.AppendLine("-------------------------------------------------");
+				output.AppendLine("Error(s) loading plugin: " + item.PluginName);
+				if (item.Exception is System.Reflection.ReflectionTypeLoadException)
+				{
+					var e = (System.Reflection.ReflectionTypeLoadException)item.Exception;
+					foreach (var ex in e.LoaderExceptions)
+					{
+						output.AppendLine(ex.ToString());
+						output.AppendLine();
+					}
+				}
+				else
+					output.AppendLine(item.Exception.ToString());
+			}
+
+			return true;
+		}
 	}
 }
diff --git a/ILSpy/Languages/CSharpILMixedLanguage.cs b/ILSpy/Languages/CSharpILMixedLanguage.cs
index 31975cc24..4f7ca57cc 100644
--- a/ILSpy/Languages/CSharpILMixedLanguage.cs
+++ b/ILSpy/Languages/CSharpILMixedLanguage.cs
@@ -34,6 +34,7 @@ using ICSharpCode.Decompiler.Disassembler;
 using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.Decompiler.Util;
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpyX;
 using ICSharpCode.ILSpyX.Extensions;
 
@@ -49,7 +50,7 @@ namespace ICSharpCode.ILSpy
 
 		protected override ReflectionDisassembler CreateDisassembler(ITextOutput output, DecompilationOptions options)
 		{
-			var displaySettings = MainWindow.Instance.CurrentDisplaySettings;
+			var displaySettings = SettingsService.Instance.DisplaySettings;
 			return new ReflectionDisassembler(output,
 				new MixedMethodBodyDisassembler(output, options) {
 					DetectControlStructure = detectControlStructure,
diff --git a/ILSpy/Languages/CSharpLanguage.cs b/ILSpy/Languages/CSharpLanguage.cs
index dcf7e91a2..df801511c 100644
--- a/ILSpy/Languages/CSharpLanguage.cs
+++ b/ILSpy/Languages/CSharpLanguage.cs
@@ -41,6 +41,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.Decompiler.Util;
 using ICSharpCode.ILSpy.TextView;
 using ICSharpCode.ILSpy.TreeNodes;
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpyX;
 
 using LanguageVersion = ICSharpCode.ILSpyX.LanguageVersion;
@@ -572,7 +573,7 @@ namespace ICSharpCode.ILSpy
 			CSharpAmbience ambience = new CSharpAmbience();
 			// Do not forget to update CSharpAmbienceTests.ILSpyMainTreeViewTypeFlags, if this ever changes.
 			ambience.ConversionFlags = ConversionFlags.ShowTypeParameterList | ConversionFlags.PlaceReturnTypeAfterParameterList;
-			if (MainWindow.Instance.CurrentDecompilerSettings.LiftNullables)
+			if (SettingsService.Instance.DecompilerSettings.LiftNullables)
 			{
 				ambience.ConversionFlags |= ConversionFlags.UseNullableSpecifierForValueTypes;
 			}
@@ -775,7 +776,7 @@ namespace ICSharpCode.ILSpy
 		public override bool ShowMember(IEntity member)
 		{
 			MetadataFile assembly = member.ParentModule.MetadataFile;
-			return showAllMembers || !CSharpDecompiler.MemberIsHidden(assembly, member.MetadataToken, MainWindow.Instance.CurrentDecompilerSettings);
+			return showAllMembers || !CSharpDecompiler.MemberIsHidden(assembly, member.MetadataToken, SettingsService.Instance.DecompilerSettings);
 		}
 
 		public override RichText GetRichTextTooltip(IEntity entity)
@@ -784,7 +785,7 @@ namespace ICSharpCode.ILSpy
 			var output = new StringWriter();
 			var decoratedWriter = new TextWriterTokenWriter(output);
 			var writer = new CSharpHighlightingTokenWriter(TokenWriter.InsertRequiredSpaces(decoratedWriter), locatable: decoratedWriter);
-			var settings = MainWindow.Instance.CurrentDecompilerSettings;
+			var settings = SettingsService.Instance.DecompilerSettings;
 			if (!settings.LiftNullables)
 			{
 				flags &= ~ConversionFlags.UseNullableSpecifierForValueTypes;
diff --git a/ILSpy/Languages/ILLanguage.cs b/ILSpy/Languages/ILLanguage.cs
index ab8f89ab7..22d060b37 100644
--- a/ILSpy/Languages/ILLanguage.cs
+++ b/ILSpy/Languages/ILLanguage.cs
@@ -30,6 +30,7 @@ using ICSharpCode.Decompiler.Solution;
 using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.Decompiler.Util;
 using ICSharpCode.ILSpy.TextView;
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpyX;
 
 namespace ICSharpCode.ILSpy
@@ -57,7 +58,7 @@ namespace ICSharpCode.ILSpy
 
 		protected virtual ReflectionDisassembler CreateDisassembler(ITextOutput output, DecompilationOptions options)
 		{
-			var displaySettings = MainWindow.Instance.CurrentDisplaySettings;
+			var displaySettings = SettingsService.Instance.DisplaySettings;
 			output.IndentationString = options.DecompilerSettings.CSharpFormattingOptions.IndentationString;
 			return new ReflectionDisassembler(output, options.CancellationToken) {
 				DetectControlStructure = detectControlStructure,
diff --git a/ILSpy/MainWindow.xaml.cs b/ILSpy/MainWindow.xaml.cs
index 810e70f99..d87bd31ff 100644
--- a/ILSpy/MainWindow.xaml.cs
+++ b/ILSpy/MainWindow.xaml.cs
@@ -83,8 +83,6 @@ namespace ICSharpCode.ILSpy
 			get { return instance; }
 		}
 
-		internal AssemblyListManager AssemblyListManager { get; }
-
 		public SharpTreeView AssemblyTreeView {
 			get {
 				return FindResource("AssemblyTreeView") as SharpTreeView;
@@ -97,40 +95,28 @@ namespace ICSharpCode.ILSpy
 			}
 		}
 
-		public DecompilerSettings CurrentDecompilerSettings { get; internal set; }
-
-		public DisplaySettingsViewModel CurrentDisplaySettings { get; internal set; }
-
 		public DecompilationOptions CreateDecompilationOptions()
 		{
 			var decompilerView = DockWorkspace.Instance.ActiveTabPage.Content as IProgress<DecompilationProgress>;
-			return new DecompilationOptions(CurrentLanguageVersion, CurrentDecompilerSettings, CurrentDisplaySettings) { Progress = decompilerView };
+			return new DecompilationOptions(CurrentLanguageVersion, SettingsService.Instance.DecompilerSettings, SettingsService.Instance.DisplaySettings) { Progress = decompilerView };
 		}
 
 		public MainWindow()
 		{
 			instance = this;
 
-			var spySettings = SettingsService.Instance.SpySettings;
 			var sessionSettings = SettingsService.Instance.SessionSettings;
 
-			this.CurrentDecompilerSettings = DecompilerSettingsPanel.LoadDecompilerSettings(spySettings);
-			this.CurrentDisplaySettings = DisplaySettingsPanel.LoadDisplaySettings(spySettings);
-			this.AssemblyListManager = new AssemblyListManager(spySettings) {
-				ApplyWinRTProjections = CurrentDecompilerSettings.ApplyWindowsRuntimeProjections,
-				UseDebugSymbols = CurrentDecompilerSettings.UseDebugSymbols
-			};
-
 			// Make sure Images are initialized on the UI thread.
 			this.Icon = Images.ILSpyIcon;
 
 			this.DataContext = new MainWindowViewModel {
 				Workspace = DockWorkspace.Instance,
 				SessionSettings = sessionSettings,
-				AssemblyListManager = AssemblyListManager
+				AssemblyListManager = SettingsService.Instance.AssemblyListManager
 			};
 
-			AssemblyListManager.CreateDefaultAssemblyLists();
+			SettingsService.Instance.AssemblyListManager.CreateDefaultAssemblyLists();
 			if (!string.IsNullOrEmpty(sessionSettings.CurrentCulture))
 			{
 				System.Threading.Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo(sessionSettings.CurrentCulture);
@@ -840,12 +826,12 @@ namespace ICSharpCode.ILSpy
 			{
 				// Load AssemblyList only in Loaded event so that WPF is initialized before we start the CPU-heavy stuff.
 				// This makes the UI come up a bit faster.
-				this.assemblyList = AssemblyListManager.LoadList(sessionSettings.ActiveAssemblyList);
+				this.assemblyList = SettingsService.Instance.AssemblyListManager.LoadList(sessionSettings.ActiveAssemblyList);
 			}
 			else
 			{
-				AssemblyListManager.ClearAll();
-				this.assemblyList = AssemblyListManager.CreateList(AssemblyListManager.DefaultListName);
+				SettingsService.Instance.AssemblyListManager.ClearAll();
+				this.assemblyList = SettingsService.Instance.AssemblyListManager.CreateList(AssemblyListManager.DefaultListName);
 			}
 
 			HandleCommandLineArguments(App.CommandLineArguments);
@@ -877,10 +863,10 @@ namespace ICSharpCode.ILSpy
 				DockWorkspace.Instance.ShowText(output);
 		}
 
-		bool FormatExceptions(App.ExceptionData[] exceptions, ITextOutput output)
+		static bool FormatExceptions(App.ExceptionData[] exceptions, ITextOutput output)
 		{
 			var stringBuilder = new StringBuilder();
-			var result = FormatExceptions(exceptions, stringBuilder);
+			var result = exceptions.FormatExceptions(stringBuilder);
 			if (result)
 			{
 				output.Write(stringBuilder.ToString());
@@ -888,35 +874,6 @@ namespace ICSharpCode.ILSpy
 			return result;
 		}
 
-		internal static bool FormatExceptions(App.ExceptionData[] exceptions, StringBuilder output)
-		{
-			if (exceptions.Length == 0)
-				return false;
-			bool first = true;
-
-			foreach (var item in exceptions)
-			{
-				if (first)
-					first = false;
-				else
-					output.AppendLine("-------------------------------------------------");
-				output.AppendLine("Error(s) loading plugin: " + item.PluginName);
-				if (item.Exception is System.Reflection.ReflectionTypeLoadException)
-				{
-					var e = (System.Reflection.ReflectionTypeLoadException)item.Exception;
-					foreach (var ex in e.LoaderExceptions)
-					{
-						output.AppendLine(ex.ToString());
-						output.AppendLine();
-					}
-				}
-				else
-					output.AppendLine(item.Exception.ToString());
-			}
-
-			return true;
-		}
-
 		#region Update Check
 		string updateAvailableDownloadUrl;
 
@@ -974,7 +931,7 @@ namespace ICSharpCode.ILSpy
 
 		public void ShowAssemblyList(string name)
 		{
-			AssemblyList list = this.AssemblyListManager.LoadList(name);
+			AssemblyList list = SettingsService.Instance.AssemblyListManager.LoadList(name);
 			//Only load a new list when it is a different one
 			if (list.ListName != CurrentAssemblyList.ListName)
 			{
@@ -1388,7 +1345,7 @@ namespace ICSharpCode.ILSpy
 			{
 				refreshInProgress = true;
 				var path = GetPathForNode(AssemblyTreeView.SelectedItem as SharpTreeNode);
-				ShowAssemblyList(AssemblyListManager.LoadList(assemblyList.ListName));
+				ShowAssemblyList(SettingsService.Instance.AssemblyListManager.LoadList(assemblyList.ListName));
 				SelectNode(FindNodeByPath(path, true), inNewTabPage: false, AssemblyTreeView.IsFocused);
 			}
 			finally
diff --git a/ILSpy/Metadata/DebugMetadataTablesTreeNode.cs b/ILSpy/Metadata/DebugMetadataTablesTreeNode.cs
index af8dd974a..9ec211751 100644
--- a/ILSpy/Metadata/DebugMetadataTablesTreeNode.cs
+++ b/ILSpy/Metadata/DebugMetadataTablesTreeNode.cs
@@ -21,6 +21,7 @@ using System.Reflection.Metadata.Ecma335;
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.ILSpy.TreeNodes;
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpy.ViewModels;
 
 namespace ICSharpCode.ILSpy.Metadata
@@ -58,7 +59,7 @@ namespace ICSharpCode.ILSpy.Metadata
 			if (ShowTable(TableIndex.CustomDebugInformation))
 				this.Children.Add(new CustomDebugInformationTableTreeNode(metadataFile));
 
-			bool ShowTable(TableIndex table) => !MainWindow.Instance.CurrentDisplaySettings.HideEmptyMetadataTables || metadataFile.Metadata.GetTableRowCount(table) > 0;
+			bool ShowTable(TableIndex table) => !SettingsService.Instance.DisplaySettings.HideEmptyMetadataTables || metadataFile.Metadata.GetTableRowCount(table) > 0;
 		}
 
 		public override bool View(TabPageModel tabPage)
diff --git a/ILSpy/Metadata/MetadataTablesTreeNode.cs b/ILSpy/Metadata/MetadataTablesTreeNode.cs
index 26bb59b21..1572ed4e3 100644
--- a/ILSpy/Metadata/MetadataTablesTreeNode.cs
+++ b/ILSpy/Metadata/MetadataTablesTreeNode.cs
@@ -23,6 +23,7 @@ using System.Reflection.Metadata.Ecma335;
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.ILSpy.TreeNodes;
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpy.ViewModels;
 
 namespace ICSharpCode.ILSpy.Metadata
@@ -50,7 +51,7 @@ namespace ICSharpCode.ILSpy.Metadata
 			}
 		}
 
-		internal static bool ShowTable(TableIndex table, MetadataReader metadata) => !MainWindow.Instance.CurrentDisplaySettings.HideEmptyMetadataTables || metadata.GetTableRowCount(table) > 0;
+		internal static bool ShowTable(TableIndex table, MetadataReader metadata) => !SettingsService.Instance.DisplaySettings.HideEmptyMetadataTables || metadata.GetTableRowCount(table) > 0;
 
 		internal static MetadataTableTreeNode CreateTableTreeNode(TableIndex table, MetadataFile metadataFile)
 		{
diff --git a/ILSpy/Options/DecompilerSettingsPanel.xaml.cs b/ILSpy/Options/DecompilerSettingsPanel.xaml.cs
index 8a55d73fb..d530079dc 100644
--- a/ILSpy/Options/DecompilerSettingsPanel.xaml.cs
+++ b/ILSpy/Options/DecompilerSettingsPanel.xaml.cs
@@ -19,6 +19,7 @@
 using System.ComponentModel.Composition;
 using System.Xml.Linq;
 
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpyX.Settings;
 
 namespace ICSharpCode.ILSpy.Options
@@ -50,15 +51,15 @@ namespace ICSharpCode.ILSpy.Options
 			var newSettings = ((DecompilerSettingsViewModel)this.DataContext).ToDecompilerSettings();
 			ISettingsProvider.SaveDecompilerSettings(root, newSettings);
 
-			MainWindow.Instance.CurrentDecompilerSettings = newSettings;
-			MainWindow.Instance.AssemblyListManager.ApplyWinRTProjections = newSettings.ApplyWindowsRuntimeProjections;
-			MainWindow.Instance.AssemblyListManager.UseDebugSymbols = newSettings.UseDebugSymbols;
+			SettingsService.Instance.DecompilerSettings = newSettings;
+			SettingsService.Instance.AssemblyListManager.ApplyWinRTProjections = newSettings.ApplyWindowsRuntimeProjections;
+			SettingsService.Instance.AssemblyListManager.UseDebugSymbols = newSettings.UseDebugSymbols;
 		}
 
 		public void LoadDefaults()
 		{
-			MainWindow.Instance.CurrentDecompilerSettings = new();
-			this.DataContext = new DecompilerSettingsViewModel(MainWindow.Instance.CurrentDecompilerSettings);
+			SettingsService.Instance.DecompilerSettings = new();
+			this.DataContext = new DecompilerSettingsViewModel(SettingsService.Instance.DecompilerSettings);
 		}
 	}
 }
diff --git a/ILSpy/Options/DisplaySettingsPanel.xaml.cs b/ILSpy/Options/DisplaySettingsPanel.xaml.cs
index 3e81eb7fe..8358a3cf5 100644
--- a/ILSpy/Options/DisplaySettingsPanel.xaml.cs
+++ b/ILSpy/Options/DisplaySettingsPanel.xaml.cs
@@ -99,7 +99,7 @@ namespace ICSharpCode.ILSpy.Options
 					select ff).ToArray();
 		}
 
-		public static DisplaySettingsViewModel LoadDisplaySettings(ILSpySettings settings)
+		public static DisplaySettingsViewModel LoadDisplaySettings(ILSpySettings settings, SessionSettings sessionSettings = null)
 		{
 			XElement e = settings["DisplaySettings"];
 			var s = new DisplaySettingsViewModel();
@@ -124,7 +124,7 @@ namespace ICSharpCode.ILSpy.Options
 			s.ShowRawOffsetsAndBytesBeforeInstruction = (bool?)e.Attribute("ShowRawOffsetsAndBytesBeforeInstruction") ?? false;
 			s.StyleWindowTitleBar = (bool?)e.Attribute("StyleWindowTitleBar") ?? false;
 
-			s.Theme = SettingsService.Instance.SessionSettings.Theme;
+			s.Theme = (sessionSettings ?? SettingsService.Instance.SessionSettings).Theme;
 
 			return s;
 		}
@@ -158,7 +158,7 @@ namespace ICSharpCode.ILSpy.Options
 			SettingsService.Instance.SessionSettings.Theme = s.Theme;
 			var sessionSettings = SettingsService.Instance.SessionSettings.ToXml();
 
-			MainWindow.Instance.CurrentDisplaySettings.CopyValues(s);
+			SettingsService.Instance.DisplaySettings.CopyValues(s);
 
 			Update(section);
 			Update(sessionSettings);
@@ -190,8 +190,8 @@ namespace ICSharpCode.ILSpy.Options
 
 		public void LoadDefaults()
 		{
-			MainWindow.Instance.CurrentDisplaySettings.CopyValues(new DisplaySettingsViewModel());
-			this.DataContext = MainWindow.Instance.CurrentDisplaySettings;
+			SettingsService.Instance.DisplaySettings.CopyValues(new DisplaySettingsViewModel());
+			this.DataContext = SettingsService.Instance.DisplaySettings;
 		}
 	}
 
diff --git a/ILSpy/Search/SearchPane.cs b/ILSpy/Search/SearchPane.cs
index f3bd6a550..7c0a2acd9 100644
--- a/ILSpy/Search/SearchPane.cs
+++ b/ILSpy/Search/SearchPane.cs
@@ -243,7 +243,7 @@ namespace ICSharpCode.ILSpy.Search
 			}
 
 			MainWindow mainWindow = MainWindow.Instance;
-			resultsComparer = mainWindow.CurrentDisplaySettings.SortResults ?
+			resultsComparer = SettingsService.Instance.DisplaySettings.SortResults ?
 				SearchResult.ComparerByFitness :
 				SearchResult.ComparerByName;
 			Results.Clear();
@@ -454,7 +454,7 @@ namespace ICSharpCode.ILSpy.Search
 				request.RegEx = regex;
 				request.SearchResultFactory = new SearchResultFactory(language);
 				request.TreeNodeFactory = new TreeNodeFactory();
-				request.DecompilerSettings = MainWindow.Instance.CurrentDecompilerSettings;
+				request.DecompilerSettings = SettingsService.Instance.DecompilerSettings;
 
 				return request;
 			}
diff --git a/ILSpy/TextView/DecompilerTextView.cs b/ILSpy/TextView/DecompilerTextView.cs
index 5d7eb069e..8aaa005ec 100644
--- a/ILSpy/TextView/DecompilerTextView.cs
+++ b/ILSpy/TextView/DecompilerTextView.cs
@@ -113,9 +113,9 @@ namespace ICSharpCode.ILSpy.TextView
 			textEditor.TextArea.Caret.PositionChanged += HighlightBrackets;
 			textEditor.MouseMove += TextEditorMouseMove;
 			textEditor.MouseLeave += TextEditorMouseLeave;
-			textEditor.SetBinding(Control.FontFamilyProperty, new Binding { Source = MainWindow.Instance.CurrentDisplaySettings, Path = new PropertyPath("SelectedFont") });
-			textEditor.SetBinding(Control.FontSizeProperty, new Binding { Source = MainWindow.Instance.CurrentDisplaySettings, Path = new PropertyPath("SelectedFontSize") });
-			textEditor.SetBinding(TextEditor.WordWrapProperty, new Binding { Source = MainWindow.Instance.CurrentDisplaySettings, Path = new PropertyPath("EnableWordWrap") });
+			textEditor.SetBinding(Control.FontFamilyProperty, new Binding { Source = SettingsService.Instance.DisplaySettings, Path = new PropertyPath("SelectedFont") });
+			textEditor.SetBinding(Control.FontSizeProperty, new Binding { Source = SettingsService.Instance.DisplaySettings, Path = new PropertyPath("SelectedFontSize") });
+			textEditor.SetBinding(TextEditor.WordWrapProperty, new Binding { Source = SettingsService.Instance.DisplaySettings, Path = new PropertyPath("EnableWordWrap") });
 
 			// disable Tab editing command (useless for read-only editor); allow using tab for focus navigation instead
 			RemoveEditCommand(EditingCommands.TabForward);
@@ -125,7 +125,7 @@ namespace ICSharpCode.ILSpy.TextView
 			textEditor.TextArea.TextView.BackgroundRenderers.Add(textMarkerService);
 			textEditor.TextArea.TextView.LineTransformers.Add(textMarkerService);
 			textEditor.ShowLineNumbers = true;
-			MainWindow.Instance.CurrentDisplaySettings.PropertyChanged += CurrentDisplaySettings_PropertyChanged;
+			SettingsService.Instance.DisplaySettings.PropertyChanged += CurrentDisplaySettings_PropertyChanged;
 
 			// SearchPanel
 			SearchPanel searchPanel = SearchPanel.Install(textEditor.TextArea);
@@ -197,14 +197,14 @@ namespace ICSharpCode.ILSpy.TextView
 			{
 				if (margin is LineNumberMargin || margin is System.Windows.Shapes.Line)
 				{
-					margin.Visibility = MainWindow.Instance.CurrentDisplaySettings.ShowLineNumbers ? Visibility.Visible : Visibility.Collapsed;
+					margin.Visibility = SettingsService.Instance.DisplaySettings.ShowLineNumbers ? Visibility.Visible : Visibility.Collapsed;
 				}
 			}
 		}
 
 		void SetHighlightCurrentLine()
 		{
-			textEditor.Options.HighlightCurrentLine = MainWindow.Instance.CurrentDisplaySettings.HighlightCurrentLine;
+			textEditor.Options.HighlightCurrentLine = SettingsService.Instance.DisplaySettings.HighlightCurrentLine;
 		}
 
 		#endregion
@@ -485,7 +485,7 @@ namespace ICSharpCode.ILSpy.TextView
 			public FlowDocumentTooltip(FlowDocument document)
 			{
 				TextOptions.SetTextFormattingMode(this, TextFormattingMode.Display);
-				double fontSize = MainWindow.Instance.CurrentDisplaySettings.SelectedFontSize;
+				double fontSize = SettingsService.Instance.DisplaySettings.SelectedFontSize;
 				viewer = new FlowDocumentScrollViewer() {
 					Width = document.MinPageWidth + fontSize * 5,
 					MaxWidth = MainWindow.Instance.ActualWidth
@@ -532,7 +532,7 @@ namespace ICSharpCode.ILSpy.TextView
 		#region Highlight brackets
 		void HighlightBrackets(object? sender, EventArgs e)
 		{
-			if (MainWindow.Instance.CurrentDisplaySettings.HighlightMatchingBraces)
+			if (SettingsService.Instance.DisplaySettings.HighlightMatchingBraces)
 			{
 				var result = SettingsService.Instance.SessionSettings.LanguageSettings.Language.BracketSearcher.SearchBracket(textEditor.Document, textEditor.CaretOffset);
 				bracketHighlightRenderer.SetHighlight(result);
@@ -754,7 +754,7 @@ namespace ICSharpCode.ILSpy.TextView
 			{
 				if (state != null)
 				{
-					state.RestoreFoldings(textOutput.Foldings, MainWindow.Instance.CurrentDisplaySettings.ExpandMemberDefinitions);
+					state.RestoreFoldings(textOutput.Foldings, SettingsService.Instance.DisplaySettings.ExpandMemberDefinitions);
 					textEditor.ScrollToVerticalOffset(state.VerticalOffset);
 					textEditor.ScrollToHorizontalOffset(state.HorizontalOffset);
 				}
@@ -778,7 +778,7 @@ namespace ICSharpCode.ILSpy.TextView
 			}
 			currentAddress = textOutput.Address;
 			currentTitle = textOutput.Title;
-			expandMemberDefinitions = MainWindow.Instance.CurrentDisplaySettings.ExpandMemberDefinitions;
+			expandMemberDefinitions = SettingsService.Instance.DisplaySettings.ExpandMemberDefinitions;
 		}
 		#endregion
 
@@ -1289,7 +1289,7 @@ namespace ICSharpCode.ILSpy.TextView
 
 		public void Dispose()
 		{
-			MainWindow.Instance.CurrentDisplaySettings.PropertyChanged -= CurrentDisplaySettings_PropertyChanged;
+			SettingsService.Instance.DisplaySettings.PropertyChanged -= CurrentDisplaySettings_PropertyChanged;
 		}
 
 		#region Unfold
diff --git a/ILSpy/TextView/DocumentationUIBuilder.cs b/ILSpy/TextView/DocumentationUIBuilder.cs
index 41cad9d61..bc7a9a409 100644
--- a/ILSpy/TextView/DocumentationUIBuilder.cs
+++ b/ILSpy/TextView/DocumentationUIBuilder.cs
@@ -37,6 +37,7 @@ using ICSharpCode.Decompiler.Documentation;
 using ICSharpCode.Decompiler.Output;
 using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.ILSpy.Options;
+using ICSharpCode.ILSpy.Util;
 
 namespace ICSharpCode.ILSpy.TextView
 {
@@ -115,7 +116,7 @@ namespace ICSharpCode.ILSpy.TextView
 			// Paragraph sadly does not support TextWrapping.NoWrap
 			var text = new TextBlock {
 				FontFamily = GetCodeFont(),
-				FontSize = MainWindow.Instance.CurrentDisplaySettings.SelectedFontSize,
+				FontSize = SettingsService.Instance.DisplaySettings.SelectedFontSize,
 				TextAlignment = TextAlignment.Left
 			};
 			text.Inlines.AddRange(richText.CreateRuns(document));
@@ -435,7 +436,7 @@ namespace ICSharpCode.ILSpy.TextView
 
 		FontFamily GetCodeFont()
 		{
-			return MainWindow.Instance.CurrentDisplaySettings.SelectedFont;
+			return SettingsService.Instance.DisplaySettings.SelectedFont;
 		}
 
 		public void AddInline(Inline inline)
diff --git a/ILSpy/Themes/WindowStyleManagerBehavior.cs b/ILSpy/Themes/WindowStyleManagerBehavior.cs
index 55d0c2c9b..60c7e6ada 100644
--- a/ILSpy/Themes/WindowStyleManagerBehavior.cs
+++ b/ILSpy/Themes/WindowStyleManagerBehavior.cs
@@ -24,6 +24,7 @@ using System.Windows.Interop;
 using System.Windows.Media;
 
 using ICSharpCode.ILSpy.Options;
+using ICSharpCode.ILSpy.Util;
 
 using TomsToolbox.Essentials;
 using TomsToolbox.Wpf;
@@ -42,7 +43,7 @@ namespace ICSharpCode.ILSpy.Themes
 		{
 			base.OnAttached();
 
-			MainWindow.Instance.CurrentDisplaySettings.PropertyChanged += DisplaySettings_PropertyChanged;
+			SettingsService.Instance.DisplaySettings.PropertyChanged += DisplaySettings_PropertyChanged;
 
 			_foreground = AssociatedObject.Track(Control.ForegroundProperty);
 			_background = AssociatedObject.Track(Control.BackgroundProperty);
@@ -61,7 +62,7 @@ namespace ICSharpCode.ILSpy.Themes
 			_foreground.Changed -= Color_Changed;
 			_background.Changed -= Color_Changed;
 
-			MainWindow.Instance.CurrentDisplaySettings.PropertyChanged -= DisplaySettings_PropertyChanged;
+			SettingsService.Instance.DisplaySettings.PropertyChanged -= DisplaySettings_PropertyChanged;
 		}
 
 		private void Color_Changed(object sender, EventArgs e)
@@ -73,7 +74,7 @@ namespace ICSharpCode.ILSpy.Themes
 		{
 			var window = AssociatedObject;
 
-			if (MainWindow.Instance.CurrentDisplaySettings.StyleWindowTitleBar)
+			if (SettingsService.Instance.DisplaySettings.StyleWindowTitleBar)
 				window.Style = (Style)window.FindResource(TomsToolbox.Wpf.Styles.ResourceKeys.WindowStyle);
 		}
 
@@ -86,7 +87,7 @@ namespace ICSharpCode.ILSpy.Themes
 		{
 			if (e.PropertyName == nameof(DisplaySettingsViewModel.StyleWindowTitleBar))
 			{
-				if (!MainWindow.Instance.CurrentDisplaySettings.StyleWindowTitleBar)
+				if (!SettingsService.Instance.DisplaySettings.StyleWindowTitleBar)
 				{
 					restartNotificationThrottle.Tick();
 					return;
diff --git a/ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs b/ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs
index f0046694b..25602d875 100644
--- a/ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs
+++ b/ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs
@@ -26,6 +26,7 @@ using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.ILSpy.Themes;
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpyX.TreeView.PlatformAbstractions;
 
 namespace ICSharpCode.ILSpy.TreeNodes
@@ -85,7 +86,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 		{
 			this.Children.Add(new AssemblyReferenceReferencedTypesTreeNode(module, r));
 
-			var resolver = parentAssembly.LoadedAssembly.GetAssemblyResolver(MainWindow.Instance.CurrentDecompilerSettings.AutoLoadAssemblyReferences);
+			var resolver = parentAssembly.LoadedAssembly.GetAssemblyResolver(SettingsService.Instance.DecompilerSettings.AutoLoadAssemblyReferences);
 			var referencedModule = resolver.Resolve(r);
 			if (referencedModule != null)
 			{
diff --git a/ILSpy/TreeNodes/AssemblyTreeNode.cs b/ILSpy/TreeNodes/AssemblyTreeNode.cs
index b28c0809f..d2f102ef2 100644
--- a/ILSpy/TreeNodes/AssemblyTreeNode.cs
+++ b/ILSpy/TreeNodes/AssemblyTreeNode.cs
@@ -33,6 +33,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.ILSpy.Controls.TreeView;
 using ICSharpCode.ILSpy.Metadata;
 using ICSharpCode.ILSpy.Properties;
+using ICSharpCode.ILSpy.Util;
 using ICSharpCode.ILSpy.ViewModels;
 using ICSharpCode.ILSpyX;
 using ICSharpCode.ILSpyX.FileLoaders;
@@ -261,7 +262,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 				ns.Children.Clear();
 			}
 			namespaces.Clear();
-			bool useNestedStructure = MainWindow.Instance.CurrentDisplaySettings.UseNestedNamespaceNodes;
+			bool useNestedStructure = SettingsService.Instance.DisplaySettings.UseNestedNamespaceNodes;
 			foreach (var type in assembly.TopLevelTypeDefinitions.OrderBy(t => t.ReflectionName, NaturalStringComparer.Instance))
 			{
 				var ns = GetOrCreateNamespaceTreeNode(type.Namespace);
@@ -327,7 +328,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 				ns.Children.Clear();
 			}
 			namespaces.Clear();
-			bool useNestedStructure = MainWindow.Instance.CurrentDisplaySettings.UseNestedNamespaceNodes;
+			bool useNestedStructure = SettingsService.Instance.DisplaySettings.UseNestedNamespaceNodes;
 			foreach (var type in assembly.TopLevelTypeDefinitions.OrderBy(t => t.ReflectionName, NaturalStringComparer.Instance))
 			{
 				var ns = GetOrCreateNamespaceTreeNode(type.Namespace);
diff --git a/ILSpy/TreeNodes/ILSpyTreeNode.cs b/ILSpy/TreeNodes/ILSpyTreeNode.cs
index d2a3c93dc..e3958a1bb 100644
--- a/ILSpy/TreeNodes/ILSpyTreeNode.cs
+++ b/ILSpy/TreeNodes/ILSpyTreeNode.cs
@@ -158,11 +158,11 @@ namespace ICSharpCode.ILSpy.TreeNodes
 
 		protected string GetSuffixString(EntityHandle handle)
 		{
-			if (!MainWindow.Instance.CurrentDisplaySettings.ShowMetadataTokens)
+			if (!SettingsService.Instance.DisplaySettings.ShowMetadataTokens)
 				return string.Empty;
 
 			int token = MetadataTokens.GetToken(handle);
-			if (MainWindow.Instance.CurrentDisplaySettings.ShowMetadataTokensInBase10)
+			if (SettingsService.Instance.DisplaySettings.ShowMetadataTokensInBase10)
 				return " @" + token;
 			return " @" + token.ToString("x8");
 		}
diff --git a/ILSpy/Util/SettingsService.cs b/ILSpy/Util/SettingsService.cs
index 0f7a07e6a..a55e2f54c 100644
--- a/ILSpy/Util/SettingsService.cs
+++ b/ILSpy/Util/SettingsService.cs
@@ -1,20 +1,34 @@
-using ICSharpCode.ILSpyX.Settings;
+using ICSharpCode.Decompiler;
+using ICSharpCode.ILSpy.Options;
+using ICSharpCode.ILSpyX;
+using ICSharpCode.ILSpyX.Settings;
 
 namespace ICSharpCode.ILSpy.Util
 {
-	internal class SettingsService
+	public class SettingsService
 	{
-		public static readonly SettingsService Instance = new SettingsService();
+		public static readonly SettingsService Instance = new();
 
 		private SettingsService()
 		{
-			this.SpySettings = ILSpySettings.Load();
-
-			SessionSettings = new(this.SpySettings);
+			SpySettings = ILSpySettings.Load();
+			SessionSettings = new(SpySettings);
+			DecompilerSettings = DecompilerSettingsPanel.LoadDecompilerSettings(SpySettings);
+			DisplaySettings = DisplaySettingsPanel.LoadDisplaySettings(SpySettings, SessionSettings);
+			AssemblyListManager = new(SpySettings) {
+				ApplyWinRTProjections = DecompilerSettings.ApplyWindowsRuntimeProjections,
+				UseDebugSymbols = DecompilerSettings.UseDebugSymbols
+			};
 		}
 
 		public ILSpySettings SpySettings { get; }
 
 		public SessionSettings SessionSettings { get; }
+
+		public DecompilerSettings DecompilerSettings { get; set; }
+
+		public DisplaySettingsViewModel DisplaySettings { get; }
+
+		public AssemblyListManager AssemblyListManager { get; }
 	}
 }
diff --git a/ILSpy/ViewModels/ManageAssemblyListsViewModel.cs b/ILSpy/ViewModels/ManageAssemblyListsViewModel.cs
index 23959c2c3..ec039552f 100644
--- a/ILSpy/ViewModels/ManageAssemblyListsViewModel.cs
+++ b/ILSpy/ViewModels/ManageAssemblyListsViewModel.cs
@@ -39,7 +39,7 @@ namespace ICSharpCode.ILSpy.ViewModels
 
 		public ManageAssemblyListsViewModel(Window parent)
 		{
-			this.manager = MainWindow.Instance.AssemblyListManager;
+			this.manager = SettingsService.Instance.AssemblyListManager;
 			this.parent = parent;
 
 			NewCommand = new DelegateCommand(ExecuteNew);
diff --git a/ILSpy/ViewModels/SearchPaneModel.cs b/ILSpy/ViewModels/SearchPaneModel.cs
index ea6fca679..d1670f72c 100644
--- a/ILSpy/ViewModels/SearchPaneModel.cs
+++ b/ILSpy/ViewModels/SearchPaneModel.cs
@@ -33,7 +33,7 @@ namespace ICSharpCode.ILSpy.ViewModels
 			ContentId = PaneContentId;
 			Title = Properties.Resources.SearchPane_Search;
 			Icon = "Images/Search";
-			ShortcutKey = new KeyGesture(Key.F, ModifierKeys.Control | ModifierKeys.Shift);
+			ShortcutKey = new(Key.F, ModifierKeys.Control | ModifierKeys.Shift);
 			IsCloseable = true;
 		}
 
diff --git a/ILSpy/Views/DebugSteps.xaml.cs b/ILSpy/Views/DebugSteps.xaml.cs
index c4177e3aa..b619cc6b7 100644
--- a/ILSpy/Views/DebugSteps.xaml.cs
+++ b/ILSpy/Views/DebugSteps.xaml.cs
@@ -124,7 +124,7 @@ namespace ICSharpCode.ILSpy
 			var window = MainWindow.Instance;
 			var state = DockWorkspace.Instance.ActiveTabPage.GetState();
 			DockWorkspace.Instance.ActiveTabPage.ShowTextViewAsync(textView => textView.DecompileAsync(window.CurrentLanguage, window.SelectedNodes,
-				new DecompilationOptions(window.CurrentLanguageVersion, window.CurrentDecompilerSettings, window.CurrentDisplaySettings) {
+				new DecompilationOptions(window.CurrentLanguageVersion, SettingsService.Instance.DecompilerSettings, SettingsService.Instance.DisplaySettings) {
 					StepLimit = step,
 					IsDebug = isDebug,
 					TextViewState = state as TextView.DecompilerTextViewState