Mobile Phone Case Opener that probably noone needs

I had a problem with my phone in the car. I use a folio case with my phone as well as a clamp that holds the phone from both sides. I also have a phone that has the fingerprint sensor in the back.

I can not fold over the folio cases lid to the back because it would cover the fingerprint sensor that I like to use - especially while driving - to unlock the phone. Also the clamp does not grip the phone that well anymore if the lid is fold over. If I leave the lid open, it flaps around with the c