Check and try to change or disable:
Settings>Display & Brightness>Text size (and zoom too)
Settings>General>Accessibility>Zoom (and bigger text too)
Try also a forced restart: On an iPhone X, iPhone 8, or iPhone 8 Plus: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then, press and hold the Side button until you see the Apple logo.
Regards
Giulio