diff --git a/OpenUtau.Core/Util/Preferences.cs b/OpenUtau.Core/Util/Preferences.cs
index 46aa926f1..c963d45c2 100644
--- a/OpenUtau.Core/Util/Preferences.cs
+++ b/OpenUtau.Core/Util/Preferences.cs
@@ -250,7 +250,7 @@ public class SerializablePreferences {
 errors.txt
 ";
             public string RecoveryPath = string.Empty;
-            public bool DetachPianoRoll = false;
+            public bool DetachPianoRoll = true;
 
             // ----- Mix FX (post-processing) -----
             // Per-track FX state lives in UTrack.MixFx and the project ustx.
diff --git a/OpenUtau/Controls/PianoRoll.axaml.cs b/OpenUtau/Controls/PianoRoll.axaml.cs
index abdb081b3..b2cdcf051 100644
--- a/OpenUtau/Controls/PianoRoll.axaml.cs
+++ b/OpenUtau/Controls/PianoRoll.axaml.cs
@@ -219,6 +219,14 @@ await MessageBox.ShowProcessing(RootWindow, $"{name} - ? / ?",
                     }
                 });
 
+            MessageBus.Current.Listen<PianorollRefreshEvent>()
+                .Subscribe(e => {
+                    if(e.refreshItem == "Attachment") {
+                        MainWindow?.SetPianoRollAttachment();
+                        ViewModel.RaisePropertyChanged(nameof(ViewModel.PianoRollDetached));
+                    }
+                });
+
             DocManager.Inst.AddSubscriber(this);
         }
 
@@ -330,8 +338,9 @@ void OnMenuSearchNote(object sender, RoutedEventArgs args) {
         }
 
         void OnMenuDetachPianoRoll(object sender, RoutedEventArgs args) {
-            MainWindow?.SetPianoRollAttachment();
-            ViewModel.RaisePropertyChanged(nameof(ViewModel.PianoRollDetached));
+            Preferences.Default.DetachPianoRoll ^= true;
+            Preferences.Save();
+            MessageBus.Current.SendMessage(new PianorollRefreshEvent("Attachment"));
         }
 
         void OnMenuHidePianoRoll(object sender, RoutedEventArgs args) {
diff --git a/OpenUtau/Strings/Strings.axaml b/OpenUtau/Strings/Strings.axaml
index 7c08bab77..b43096d13 100644
--- a/OpenUtau/Strings/Strings.axaml
+++ b/OpenUtau/Strings/Strings.axaml
@@ -571,6 +571,7 @@ Warning: this option removes custom presets.</system:String>
   <system:String x:Key="prefs.appearance.showghostnotes">Show other tracks' notes on piano roll</system:String>
   <system:String x:Key="prefs.appearance.showicon">Show icon on piano roll</system:String>
   <system:String x:Key="prefs.appearance.showportrait">Show portrait on piano roll</system:String>
+  <system:String x:Key="prefs.appearance.detachpianoroll">Show piano roll in separate window</system:String>
   <system:String x:Key="prefs.appearance.sortorder">Singer name display language</system:String>
   <system:String x:Key="prefs.appearance.theme">Theme</system:String>
   <system:String x:Key="prefs.appearance.theme.dark">Dark</system:String>
diff --git a/OpenUtau/ViewModels/PreferencesViewModel.cs b/OpenUtau/ViewModels/PreferencesViewModel.cs
index 9db829b46..ce60bb44c 100644
--- a/OpenUtau/ViewModels/PreferencesViewModel.cs
+++ b/OpenUtau/ViewModels/PreferencesViewModel.cs
@@ -100,6 +100,7 @@ public int SafeMaxThreadCount {
         [Reactive] public bool ShowPortrait { get; set; }
         [Reactive] public bool ShowIcon { get; set; }
         [Reactive] public bool ShowGhostNotes { get; set; }
+        [Reactive] public bool DetachPianoRoll { get; set; }
         [Reactive] public bool ThemeEditable { get; set; }
         public List<string> ThemeItems => ThemeManager.GetAvailableThemes();
         public bool IsThemeEditorOpen => Views.ThemeEditorWindow.IsOpen;
@@ -183,6 +184,7 @@ public PreferencesViewModel() {
             ShowPortrait = Preferences.Default.ShowPortrait;
             ShowIcon = Preferences.Default.ShowIcon;
             ShowGhostNotes = Preferences.Default.ShowGhostNotes;
+            DetachPianoRoll = Preferences.Default.DetachPianoRoll;
             Beta = Preferences.Default.Beta;
             LyricsHelper = LyricsHelpers.FirstOrDefault(option => option.klass.Equals(ActiveLyricsHelper.Inst.GetPreferred()));
             LyricsHelperBrackets = Preferences.Default.LyricsHelperBrackets;
@@ -305,6 +307,12 @@ public PreferencesViewModel() {
                     Preferences.Save();
                     MessageBus.Current.SendMessage(new PianorollRefreshEvent("Part"));
                 });
+            this.WhenAnyValue(vm => vm.DetachPianoRoll)
+                .Subscribe(detachPianoRoll => {
+                    Preferences.Default.DetachPianoRoll = detachPianoRoll;
+                    Preferences.Save();
+                    MessageBus.Current.SendMessage(new PianorollRefreshEvent("Attachment"));
+                });
             this.WhenAnyValue(vm => vm.Beta)
                 .Subscribe(beta => {
                     Preferences.Default.Beta = beta;
diff --git a/OpenUtau/Views/MainWindow.axaml.cs b/OpenUtau/Views/MainWindow.axaml.cs
index 5ea4cdb0c..521e81153 100644
--- a/OpenUtau/Views/MainWindow.axaml.cs
+++ b/OpenUtau/Views/MainWindow.axaml.cs
@@ -1223,21 +1223,18 @@ public void SetPianoRollAttachment() {
                 return;
             }
             if (Preferences.Default.DetachPianoRoll) {
-                pianoRollWindow?.ForceClose();
-                pianoRollWindow = null;
-                PianoRollContainer.Content = pianoRoll;
-                viewModel.ShowPianoRoll = true;
-                Preferences.Default.DetachPianoRoll = false;
-            } else {
                 PianoRollContainer.Content = null;
                 viewModel.ShowPianoRoll = false;
                 if (pianoRollWindow == null) {
                     pianoRollWindow = new(pianoRoll);
                     pianoRollWindow.Show();
                 }
-                Preferences.Default.DetachPianoRoll = true;
+            } else {
+                pianoRollWindow?.ForceClose();
+                pianoRollWindow = null;
+                PianoRollContainer.Content = pianoRoll;
+                viewModel.ShowPianoRoll = true;
             }
-            Preferences.Save();
         }
 
         public void MainPagePointerWheelChanged(object sender, PointerWheelEventArgs args) {
diff --git a/OpenUtau/Views/PreferencesDialog.axaml b/OpenUtau/Views/PreferencesDialog.axaml
index e116bbe34..9779a5b8d 100644
--- a/OpenUtau/Views/PreferencesDialog.axaml
+++ b/OpenUtau/Views/PreferencesDialog.axaml
@@ -269,6 +269,10 @@
             <TextBlock Text="{DynamicResource prefs.appearance.showghostnotes}" HorizontalAlignment="Left"/>
             <ToggleSwitch IsChecked="{Binding ShowGhostNotes}"/>
           </Grid>
+          <Grid Margin="0,5,0,0">
+            <TextBlock Text="{DynamicResource prefs.appearance.detachpianoroll}" HorizontalAlignment="Left"/>
+            <ToggleSwitch IsChecked="{Binding DetachPianoRoll}"/>
+          </Grid>
         </StackPanel>
 
         <!-- UTAU -->