Edit dialogs not found in Application Designer

I recently got a great question from Ernie.  The question was this:

Would you happen to know how to hide the Person Group tab on select
ownership menu option? I need to be able to assign an owner and owner
group. I have already creating a lookup field for person group and need to
remove the option to select a person group from the select owner menu.

I’m sure he read the post on how to edit dialogs in application designer but the dialog he was looking for didn’t exist in there.  The way to modify this dialog is the same as changing the location drilldown limit.