How to restore the text message font when it becomes larger?

Method 1: Adjust the font size by the side volume ↑ key and the left key Note: Some models may need to be set in advance (Information-Menu-Settings-Use the volume key to change the text size.

Method 2: Two fingers stretch, two fingers stretch outward to enlarge the font, and two fingers draw inward to reduce the font.

If it is not man-made, it may be a system failure.

Fault refers to the state that the system cannot perform the specified function. In a computer, a system failure means that the system stops running for some reason, so that the transaction is terminated in an abnormal way during execution, resulting in the loss of information in the memory, while the data stored in the external memory is not affected.