The specific operation includes the following steps:
First, open "Photos" on the phone's desktop.
2. Open the picture to be operated in "Album" and click the "Share" sign in the lower left corner.
3. Then click "Assign to Contact" to operate.
4. Select the "contact person" who needs to set the avatar in the Address Book.
5. Adjust the area of the avatar and click "Select".
6. The above has been established. When the designated contact calls, the avatar can be displayed in full screen.