Why do short messages sent by mobile phones only show new information, but not the content of the information?

The setting steps are as follows: 1. Enter the main screen interface, and then click the "Settings" icon. 2. Click the "Notification Center" option to enter. 3. Slide down to find the "Information" option, and click Enter. 4. Slide the screen down to see the option "Show on the locked screen", which is turned on by default, just turn it off.