A. Check if the app has its own settings for text size. Open the app, go to Settings (if available), and look for 'Text Size' or 'Accessibility' options to adjust the font size within the app itself.

B. If the app does not support changing font size, you can try adjusting the overall text size on your iPhone. Go to Settings > Display & Brightness > Text Size and adjust the slider. This may not affect the app but can help with other text in iOS.