How to change font in one app ?

Hello afromhome,

Thanks for posting in the Apple Support Communities.

Check out the steps below to see if this is the method you use to adjust the font size. You can also locate this information here: Adjust the display and text size on iPhone - Apple Support

Adjust the text size when you’re using an app

1. Open Control Center, then tap .


(If you don’t see , add it to Control Center—go to Settings > Control Center, then choose Text Size).

2. Drag the slider up or down to increase or decrease the text size.

To change the text size for all apps, tap All Apps at the bottom of the screen.

If that's not helpful, check the settings of the app itself to see if you can adjust the font as this may be a feature in some apps.

Have a great day!