The font of the short message suddenly becomes larger. How to adjust it?

The font of SMS suddenly becomes larger, and the adjustment method is as follows:

Tools: OPPOA93, Coloros11.1,settings.

1. Locate the "Settings" icon on the desktop, as shown in the red box.

2. Click "Settings" to enter the settings page, and find "Display and Brightness" in the lower-middle position.

3. Click "Reality and Brightness" to enter the page of display and brightness level, and find "Font".

4. Click "Font" to enter the font resizing page, and you will see a small circle that you can drag, as shown in the figure.

5. Click the left mouse button on the small circle and drag left and right to adjust the font size.