White line at bottom of screen

Assuming you mean this line...

...then sometimes it helps to completely close the app, then reopen it. It may also be solved by going out of fullscreen, then back in.

If that doesn't help, try restarting your iPhone or force restarting your iPhone.

Letfraine Said:

"White line at bottom of screen: How do i make the white line at the bottom of my iPhone 12 screen go away when I am watching movies"

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Troubleshooting White Line:

Start with a Force Restart:

Refer to this link: Force Restart iPhone - Apple Support

Interesting… You may need to contact the app developer about this, as it seems like their problem.

How to contact an app developer - Apple Support