diff --git a/Assets/VRM10/Editor/Components/Expression/SerializedExpressionEditor.cs b/Assets/VRM10/Editor/Components/Expression/SerializedExpressionEditor.cs
index 5dae1db06..249bea2f0 100644
--- a/Assets/VRM10/Editor/Components/Expression/SerializedExpressionEditor.cs
+++ b/Assets/VRM10/Editor/Components/Expression/SerializedExpressionEditor.cs
@@ -33,21 +33,10 @@ namespace UniVRM10
 
         bool m_changed;
 
-        public struct EditorStatus
-        {
-            public int Mode;
-            public bool MorphTargetFoldout;
-            public bool OptionFoldout;
-            public bool ListFoldout;
-
-            public static EditorStatus Default => new EditorStatus
-            {
-                MorphTargetFoldout = true,
-            };
-        }
-        EditorStatus m_status = EditorStatus.Default;
-
-        public EditorStatus Status => m_status;
+        static int s_Mode;
+        static bool s_MorphTargetFoldout = true;
+        static bool s_OptionFoldout;
+        static bool s_ListFoldout;
 
         static string[] MODES = new[]{
             "MorphTarget",
@@ -60,18 +49,17 @@ namespace UniVRM10
 
         public SerializedExpressionEditor(SerializedObject serializedObject,
             PreviewSceneManager previewSceneManager) : this(
-                serializedObject, (VRM10Expression)serializedObject.targetObject, previewSceneManager, EditorStatus.Default)
+                serializedObject, (VRM10Expression)serializedObject.targetObject, previewSceneManager)
         { }
 
         public SerializedExpressionEditor(VRM10Expression expression,
-            PreviewSceneManager previewSceneManager, EditorStatus status) : this(
-                new SerializedObject(expression), expression, previewSceneManager, status)
+            PreviewSceneManager previewSceneManager) : this(
+                new SerializedObject(expression), expression, previewSceneManager)
         { }
 
         public SerializedExpressionEditor(SerializedObject serializedObject, VRM10Expression targetObject,
-            PreviewSceneManager previewSceneManager, EditorStatus status)
+            PreviewSceneManager previewSceneManager)
         {
-            m_status = status;
             this.m_serializedObject = serializedObject;
             this.m_targetObject = targetObject;
 
@@ -101,8 +89,8 @@ namespace UniVRM10
                 m_targetObject, typeof(VRM10Expression), false);
             GUI.enabled = true;
 
-            m_status.MorphTargetFoldout = CustomUI.Foldout(Status.MorphTargetFoldout, "MorphTarget");
-            if (Status.MorphTargetFoldout)
+            s_MorphTargetFoldout = CustomUI.Foldout(s_MorphTargetFoldout, "MorphTarget");
+            if (s_MorphTargetFoldout)
             {
                 EditorGUI.indentLevel++;
                 var changed = MorphTargetBindsGUI();
@@ -117,12 +105,12 @@ namespace UniVRM10
                 EditorGUI.indentLevel--;
             }
 
-            m_status.ListFoldout = CustomUI.Foldout(Status.ListFoldout, "List");
-            if (Status.ListFoldout)
+            s_ListFoldout = CustomUI.Foldout(s_ListFoldout, "List");
+            if (s_ListFoldout)
             {
                 EditorGUI.indentLevel++;
-                m_status.Mode = GUILayout.Toolbar(Status.Mode, MODES);
-                switch (Status.Mode)
+                s_Mode = GUILayout.Toolbar(s_Mode, MODES);
+                switch (s_Mode)
                 {
                     case 0:
                         // MorphTarget
@@ -157,8 +145,8 @@ namespace UniVRM10
                 EditorGUI.indentLevel--;
             }
 
-            m_status.OptionFoldout = CustomUI.Foldout(Status.OptionFoldout, "Option");
-            if (Status.OptionFoldout)
+            s_OptionFoldout = CustomUI.Foldout(s_OptionFoldout, "Option");
+            if (s_OptionFoldout)
             {
                 EditorGUI.indentLevel++;