How to set-up profile editing uniquely for each user?

[Darren_Murphy]

Viewing as different users changes nothing

That’s a big clue, yes You need to do one of two things. Either: a) Enable Row Owners on your User Profiles sheet, or b) Filter the view to only show the row where the email “is signed-in user” The first option is the more secure option, as with Row Owners enabled only that single row of data will be downloaded to the users device.