We can only remove folders on the start screen of Oppo-Smartphones if we delete all app shortcuts in them, and as soon as the last app has been removed, the folder will be deleted as well.

Android 10 (ColorOS 7.0)
Step 1:  Tap and hold the desired  Folder
Step 2:  Tap on  Remove
  1. Tap and hold the desired Folder
  2. Tap on Remove

Oppo Instructions
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