Apple is proud of its various fonts. However, sometimes the standard text size on iPhone and iPad displays is hard to read. However, you can enable a system-wide bold font and improve the readability of text. How it works:
First, open the Settings app. If you can not find it on your iPhone or iPad home screen, swipe down on your display and find it in Spotlight.
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after enabling the "Bold" option in first and third party apps Remember to make your iPhone or iPad larger font Remember that not all fonts print bold.
Adjust text size
If you want to make the bold text on your iPhone or iPad even more readable, you can use the Resize Text You can use an integrated tool on your iPhone or iPad to manually size the text
Open the Settings app as you did before. Touch "Display & Brightness" and scroll down and tap "Text Size".
Use the slider to adjust the text to the desired size. The default is the middle one, so you can zoom in or out.