Okay, I understand what you are referring to now. You are speaking about the rounded edges. When I look at my iPhone 12 Pro, the selections in Settings also show the rounded edges on my iPhone with iOS 15. I wonder if you have the iPhone display set to Zoom in Settings. Check Settings>Display & Brightness, then under Display Zoom do you have View set to Standard? That could be an explanation. I would test on my iPhone, but that requires a restart of the device and may alter some other settings. I'm getting ready to do a backup of my iPhone and go pick up my iPhone 13 Pro, so I don't wish to change any settings right now.