How does Apple adjust the font size of text?

Only the font size of the whole machine can be adjusted, and the font size of short messages cannot be adjusted separately. The method is as follows:

1. Open the settings of the mobile phone and click General;

2, in the routine, click on the auxiliary function;

3. After entering the auxiliary function, click on a larger font;

4. In a larger font, drag the slider below to adjust the font size.