Deleting a folder is relatively easy, you have to remove all apps from the folder.

Android 10 (MIUI 12.0)
Step 1:  Tap on a  folder
Step 2:  Tap and hold an  app icon   (the last one remaining)
Step 3:  Drag the  app icon  from the folders area
Step 4:  Release the  app icon  to position it on home screen
  1. Tap on a folder
  2. Tap and hold an app icon (the last one remaining)
  3. Drag the app icon from the folders area
  4. Release the app icon to position it on home screen

Xiaomi Instructions
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