Question What is "Serialized Data Mode Controller" in a UI ToolKit Editor Window instance?

I'm trying to debug a strange problem and came across the fields shown in the image. Is this something to do with the persisted view data? Do I need to do anything with the Data Mode selection? (This has nothing to do with what I'm trying to troubleshoot, more like what is it?)

I can't find any documentation about this so I assume it's ignorable for editor windows...

 

If you are using Odin, this is my fix for OdinEditorWindow.

Code (CSharp):

1. using Sirenix.OdinInspector.Editor;
2. using UnityEditor;
3.  
4. public class OdinEditorWindowFixed : OdinEditorWindow
5. {
6.      private SerializedObject _serializedObject;
7.      private PropertyTree _propertyTree;
8.      protected override void OnEnable()
9.      {
10.          base.OnEnable();
11.          _serializedObject = new SerializedObject(this);
12.          _propertyTree = PropertyTree.Create(_serializedObject);
13.      }
14.    
15.      protected override void OnGUI()
16.      {
17.          EditorGUI.BeginChangeCheck();
18.          _propertyTree.UpdateTree();
19.          foreach (var property in _propertyTree.EnumerateTree())
20.          {
21.              if (!property.PrefabModificationPath.Contains("m_SerializedDataModeController"))
22.              {
23.                  property.Draw();
24.              }
25.          }
26.          if (EditorGUI.EndChangeCheck())
27.          {
28.              _propertyTree.ApplyChanges();
29.          }
30.      }
31.      protected override void OnDisable()
32.      {
33.          base.OnDisable();
34.          _propertyTree.Dispose();
35.      }
36. }