The font of vivo SMS suddenly became larger. How to adjust it?

The font of the short message interface of vivo mobile phone can be enlarged and reduced independently (without affecting the font size of the system). When the font of SMS becomes larger, just open the information details interface, hold down the screen with two fingers and slide relatively (the two fingers slowly close together), and the font can be reduced.

Note: OriginOS/Funtouch OS 9. 1 and later versions do not support this function.