I don't know why the font has become so big, how to turn it down?

If you are using a vivo mobile phone, when the text font becomes larger, you can refer to the following processing path:

The font of SMS interface can be enlarged and reduced independently (without affecting the font size of the system).

When the text message font becomes larger, you can open the information details interface, and use two fingers to hold the screen and slide relatively (the two fingers slowly close together) to reduce the font.

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

The reason for this is the following：

1, the font size is the uniform size of the system, and the font size of the system can be adjusted uniformly in the settings.

2. You can double-click the information copy to enter the full-screen enlargement page to view the enlarged font. -It is recommended to view the content in large font like this.