Is it possible that the screen is zoomed on your iPhone 12 Pro Max?
DOUBLE TAP with THREE FINGERS on the screen of your iPhone and that should return the screen to normal viewing size.
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If the above does not work then, Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:
- Press and quickly release Volume UP button
- Press and quickly release Volume DOWN button
- Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF).
Axel F.