stop wifi on Big Sur connecting to personal hotspot

my home internet drops out everyday for about 10 mins. Sometimes 2-3 times a day. So during this 10 mins I used my personal hotspot once. Now every time my home internet drops out my Mac defaults to personal hotspot - and now my mobile/cell phone data is maxed out. How do I get my Mac to stop doing this? I have personal hotspot switched off on my iPhone and I have deleted it entirely from system prefs (see pics). How can it possibly see personal hotspot as an option if I have deleted it? It STILL sees it in the menu bar!