How to set personal contacts for Xiaomi mobile phone?

1. Click the SMS icon to enter the SMS interface, hold down the screen and slide down until a lock appears. ?

2. Click the privacy settings below, and then click Add Private Contacts at the bottom.

3. When we enter the SMS interface and click the menu, we will find that the "Private SMS" option in the original menu bar is missing, and we don't know how to set private SMS everywhere. "Pull down and open in the SMS interface." After clicking the SMS icon to enter the SMS interface, we have to use two fingers to alternately slide down the SMS interface until the search box in the SMS interface is opened in the middle of the mobile phone interface, which is really hidden and private.