We can completely empty the call history or log of calls from the phone app on the OnePlus smartphone without having to delete every single entry.

When the call history is completely cleared, all entries of made, received and missed calls are deleted.

Note: Individual entries can be deleted by tapping and holding the corresponding item.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Phone app
Step 2:  Open the  menu
Step 3:  Tap on  Call history
Step 4:  Open the  menu
Step 5:  Tap on  Clear call history
Step 6:  Confirm with  OK
  1. Open the Phone app
  2. Open the menu
  3. Tap on Call history
  4. Open the menu
  5. Tap on Clear call history
  6. Confirm with OK

OnePlus Instructions