Turn on your phone and click Settings.
Click on the desktop and wallpaper in the settings interface.
Click the Lock Screen Signature option.
Edit the settings again, and then click OK.
If it is not displayed yet, it may be a theme. You can open the theme.
Then choose to change a mobile phone theme.
According to the above method, the problem of not displaying can generally be solved.
If it still doesn't display, you can restart the phone, or update and upgrade the phone system version.