Hello!
On the topic of multi-access sheets, the red "Remove Permission to Sheet" button is a wonderful addition, but it comes with a huge risk in its current state.
Perhaps when you click it, it can give you the classic "Are you sure you wish to remove permission to this sheet? (Yes/No)" message, so you don't accidentally click it once and lose a sheet possibly forever, or have to deal with adding the permission back.
P.S. I love what you all have done so far! I'll happily put in feedback to improve this wonderful site and support such an awesome team! ^w^