Fingerprints that are not required should be removed from the Oppo smartphone for security reasons, whether they are your own or other people's fingerprints.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Fingerprint, face & password
Step 3:  Tap on  Fingerprint
Step 4:  Enter your current  Password/PIN/Pattern
Step 5:  Tap on  Delete
Step 6:  Confirm with  Delete
  1. Open the Settings
  2. Tap on Fingerprint, face & password
  3. Tap on Fingerprint
  4. Enter your current Password/PIN/Pattern
  5. Tap on Delete
  6. Confirm with Delete

Oppo Instructions