If you are using a Vivo phone, you can refer to the following processing path when the font of SMS becomes too big:

The font of the SMS interface can be enlarged and reduced individually (it does not affect the system font size)

When the font of the SMS becomes too big, you can reduce the size of the font when you open the message details interface, and slide the screen relatively with your two fingers holding down the screen (with your two fingers slowly coming together).

Note: This feature is not supported on OriginOS/Funtouch OS 9.1 and later versions.

The reasons are as follows:

1, the font size is the system uniform size, you can adjust the system font size uniformly in the settings.

2, you can double-click the message text to enter the full-screen zoom page to view the enlarged font. - - Suggests that large font content can be viewed this way.