Until today afternoon, I had always covered my iPhone 7+ with tempered glass. It was perhaps my paranoid mindset which made me install the tempered glass within moments of starting to use the iPhone.
I wish I had waited a bit before applying it. The reason which made me remove it was the obstruction it caused when I tried to bring up multitasking menu through the edge of the screen. And now I am so glad I removed it. It is so smooth to switch apps (I'm on beta iOS 11.1) now.
Do yourself a favour and remove it and then try using the phone. Thank me later. Stop being paranoid (like me:)) about the scratches and start using without the tempered glass and you will notice how much better your phone feels.