Try conditional modifier for preferredColorScheme

Multiplatform/Shared/MainApp.swift

@@ -146,7 +146,9 @@ struct MainApp: App {
 			SceneNavigationView()
 				.environmentObject(sceneModel)
 				.environmentObject(defaults)
-		}.commands {
+				.modifier(PreferredColorSchemeModifier(preferredColorScheme: defaults.userInterfaceColorPalette))
+		}
+		.commands {
 			CommandGroup(after: .newItem, addition: {
 				Button("New Feed", action: {})
 					.keyboardShortcut("N")
@@ -193,3 +195,20 @@ struct MainApp: App {
 		#endif
 	}
 }
+
+struct PreferredColorSchemeModifier: ViewModifier {
+
+	var preferredColorScheme: UserInterfaceColorPalette
+
+	@ViewBuilder
+	func body(content: Content) -> some View {
+		switch preferredColorScheme {
+		case .automatic:
+			content
+		case .dark:
+			content.preferredColorScheme(.dark)
+		case .light:
+			content.preferredColorScheme(.light)
+		}
+	}
+}

Multiplatform/Shared/Sidebar/SidebarToolbar.swift

@@ -9,7 +9,8 @@
 import SwiftUI
 
 struct SidebarToolbar: View {
-    
+
+	@EnvironmentObject private var appSettings: AppDefaults
 	@State private var showSettings: Bool = false
 	
 	var body: some View {
@@ -40,7 +41,7 @@ struct SidebarToolbar: View {
 		}
 		.background(VisualEffectBlur(blurStyle: .systemChromeMaterial).edgesIgnoringSafeArea(.bottom))
 		.sheet(isPresented: $showSettings, onDismiss: { showSettings = false }) {
-			SettingsView()
+			SettingsView().modifier(PreferredColorSchemeModifier(preferredColorScheme: appSettings.userInterfaceColorPalette))
 		}
 	
     }

Multiplatform/iOS/AppDelegate.swift

@@ -407,13 +407,13 @@ private extension AppDelegate {
 	}
 
 	func updateUserInterfaceStyle() {
-		switch AppDefaults.shared.userInterfaceColorPalette {
-		case .automatic:
-			window?.overrideUserInterfaceStyle = .unspecified
-		case .light:
-			window?.overrideUserInterfaceStyle = .light
-		case .dark:
-			window?.overrideUserInterfaceStyle = .dark
-		}
+//		switch AppDefaults.shared.userInterfaceColorPalette {
+//		case .automatic:
+//			window?.overrideUserInterfaceStyle = .unspecified
+//		case .light:
+//			window?.overrideUserInterfaceStyle = .light
+//		case .dark:
+//			window?.overrideUserInterfaceStyle = .dark
+//		}
 	}
 }

Multiplatform/iOS/Settings/Submenus/ColorPaletteContainerView.swift

@@ -31,7 +31,7 @@ struct ColorPaletteContainerView: View {
 		if let colorPalette = UserInterfaceColorPalette(rawValue: index) {
 			appSettings.userInterfaceColorPalette = colorPalette
 		}
-		presentationMode.wrappedValue.dismiss()
+		self.presentationMode.wrappedValue.dismiss()
 	}
 }