Why does the font of Cool 8702 SMS become larger, and how to get it back?

If you want to change the font back, in fact, just press the volume button at this time and the font will change back. In fact, when you press the volume+or-,the font can be smaller or larger.

If you want to change the font size of SMS without setting the volume button, you can change it directly in the settings. In the first interface of SMS, click the menu button on the far left, select Settings, and then check or uncheck it, and the settings will be successful.