I see. It only works on the little head. When I click on the big head in profile it does nothing. It works when I click on my little icon too. Some places clicking on the little icon does not display it. Now I know what the User Card Background is, my unasked question “what is a User Card” is answered.
Okay, here is a suggestion about the setup of these items in Profile Preferences…
Edit: That material has been moved to this topic Profile Background and User Card Backgound