Why do text messages always lock the screen?

Taking Xiaomi mobile phone as an example, the preview of display content can be turned off when the screen is locked.

Find the settings icon in the main interface of the mobile phone, and click Enter.

Find the "System Application" option in the setting interface, and click Enter.

In the system application interface, slide down to find "SMS" and click Enter.

You can find the "Show Preview Content Option" in the SMS interface, just turn off the button on the right.

At this point, receiving the short message will stop displaying the short message content on the screen.