When contacts are added to the Favorites, they are displayed in various preferred locations, and Favorites can also be added as a group to exceptions, such as the Do Not Disturb feature or as a whitelist for blocked calls.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Contacts -App
Step 2:  Tap on  Contact  you want
Step 3:  Tap the  star icon  to mark/unmark the contact as a favorite
  1. Open the Contacts-App
  2. Tap on Contact you want
  3. Tap the star icon to mark/unmark the contact as a favorite

Oppo Instructions
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