Hey Version11Screen,
It sounds like you're seeing the display cut off for apps and websites. We can understand wanting to look into that further. We want to help.
It sounds like zoom may be enabled on the iPhone. You can find information to disable that here: Zoom in on the iPhone screen
Thanks!
Perhaps you have somehow turned on the Zoom feature of Accessibility?
If you need more details, the following article might help
https://www.apple.com/ios/accessibility-tips/