Incoming calls can be rejected on the Oppo smarphone by dragging the phone icon downwards.

Android 11 | ColorOS 11.0
How to Reject an Incoming call - Drag the  Phone icon  down
How to Reject an Incoming call - Release the  Phone icon  to reject the call
  1. Drag the Phone icon down
  2. Release the Phone icon to reject the call

Oppo Instructions
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