We can delete an entire conversation or chat at once without having to select each message, whether it's SMS or MMS, individually.

After deleting a conversation in the Messages app on the OnePlus smartphone, the messages contained therein cannot be restored.

Android 10 (OxygenOS 10.0)
Step 1:  Open the  Messages app
Step 2:  Tap and hold a  conversation
Step 3:  Tap on  Delete
Step 4:  Confirm with  Delete
  1. Open the Messages app
  2. Tap and hold a conversation
  3. Tap on Delete
  4. Confirm with Delete

OnePlus Instructions
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