I’m just asking if there is any possibility to hide the “Object Picker” (The little knob/menu next to an ObjectField in a custom Inspector. I have some cases where changes are disabled (DisableGroup) and I would like to also hide the knob while the content can not be changed.
I would suggest to ignore the result and disable the ObjectField with EditorGUI.DisabledScope. It will show the object, you can use it to select it, but you cannot change the value.
Example:
using (new EditorGUI.DisabledScope(true))
{
EditorGUILayout.ObjectField(my_object, typeof(GameObject), true);
}