Keep data on CustomEditor after moving from the GameObject with the editor to another GameObject.

I have a custom editor for a GameObject with a checkbox like this:

 public class GridEditor : Editor {
 private bool activateEditor = true;
 
     public override void OnInspectorGUI()
     {
         activateEditor = EditorGUILayout.Toggle("Activate Editor", activateEditor);
     }
 }

The problem I am facing is that when I change on the Hierarchy window from the GameObject with the editor to any other GameObject and I go back again to the GameObject with the editor, the state of the checkbox is not kept. How can I solve this?