If you use a vivo phone, you need to adjust the font size of the phone:

Please go to Settings-System Management/More Settings-About Phone or Go to Settings-My Device-More Parameters, and check the phone version:

1、OriginOS/iQOO？ UI？ And then what? Funtouch？ OS？ 4.0 and above systems (except Funtouch? 9.2 system): setting-display and brightness-font size;

2、Funtouch？ 9.2 System: Settings-Desktop, Lock Screen and Wallpaper-Font Size;

3、Funtouch？ OS？ 4.0 Before the system: Settings-Wallpaper and Font-Mining-Font/Local Font-Font /A in the upper right corner.

Some software, such as WeChat and browser, can adjust the font size independently in the internal settings of the software. If the adjustment in the I topic is invalid, you can enter the application settings to operate.