How to set Apple's mobile phone information hiding?

The setting method of Apple's mobile phone information hiding is as follows:

Tools/materials: iPhone 13 pro, iOS 15, setting 7.5.2.

1, open the settings that come with Apple's mobile phone, find the notification option, and click Enter.

2. Find the display preview in the notification, and then click Enter.

3. Set the display preview to never hide the contents of the received mail.