We can set the name format of the call list in the phone app ourselves and determine whether the names displayed on the OnePlus smartphone should be first name or last name first.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Phone app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Display options
Step 5:  Tap on  Name format
Step 6:  Choose  First name first  or  Last name first
  1. Open the Phone app
  2. Open the menu
  3. Open the Settings
  4. Tap on Display options
  5. Tap on Name format
  6. Choose First name first or Last name first

OnePlus Instructions