Hi @FrankHerbert ,
Apologies, I missed a detail here. The setting I pointed you do should make it so a user cannot move a point after initial creation. I think you'll want to keep the manual location disabled - basically after a user drops a point they can pan the map and hit "update point", but with manual location they won't be able to do that.
For your initial ask though, under App Settings in Field Maps Designer, there's also the "Feature actions" section. That's where you can disable "Collect Here" so that they can't drop a pin and collect a feature at that location.

If you disable Collect Here and manual locations, they will only be able to submit points at their current GPS location.
I hope that helps!