If adding multiple apps is hardly a problem, we have to remove apps from the folder one by one on the LG device, but it's not possible to edit a season.

Android 9 | LG UX 9.0
Step 1:  Open desired  Folder
Step 2:  Tap on  Manage
Step 3:  Unselect all desired  Apps
Step 4:  Confirm with  Done
  1. Open desired Folder
  2. Tap on Manage
  3. Unselect all desired Apps
  4. Confirm with Done

LG Instructions
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