On the Oppo smartphone, contacts that are no longer needed can be deleted individually or with a multiple selection.

Android 10 | ColorOS 7.0
Step 1:  Open the  Contacts -App
Step 2:  Tap on  Contact  you want
Step 3:  Open the  Menu
Step 4:  Tap on  Delete Contact
Step 5:  Confirm with  Delete Contact
  1. Open the Contacts-App
  2. Tap on Contact you want
  3. Open the Menu
  4. Tap on Delete Contact
  5. Confirm with Delete Contact

Oppo Instructions