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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