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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 11 | ColorOS 11.0 | Google Contacts
Step 1: Tap on  Contacts
Step 2: Choose a  Contact
Step 3: Tap on  Favorite  to mark or unmark the contact
  1. Tap on Contacts
  2. Choose a Contact
  3. Tap on Favorite to mark or unmark the contact
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