Persist selected item display mode changes

MainWindow.xaml.cs

@@ -114,6 +114,11 @@ public partial class MainWindow : Window
 
     private void ItemsTree_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
     {
+        if (!isLoadingSelection && selectedItem is not null)
+        {
+            ApplyCurrentItem();
+        }
+
         if (e.NewValue is not TreeViewItem treeItem || treeItem.Tag is not LauncherItem item)
         {
             selectedItem = null;
@@ -946,6 +951,23 @@ public partial class MainWindow : Window
         }
     }
 
+    private void ItemDisplayModeBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        if (isLoadingSelection)
+        {
+            return;
+        }
+
+        if (selectedItem is not null && ItemDisplayModeBox.SelectedItem is LauncherDisplayMode itemMode)
+        {
+            selectedItem.DisplayMode = itemMode;
+            selectedPath = FindItemPath(selectedItem);
+            StatusText.Text = "Click Save to keep the selected item display mode.";
+        }
+
+        UpdatePreview();
+    }
+
     private void EnsureAutomaticIconPath()
     {
         if (TypeBox.SelectedItem is LauncherItemType.Menu)