To delete a custom folder, please follow these steps:
Open the Insight Timer app.
Tap the Saved tab (fifth icon at the bottom of the screen).
Select the Folder you would like to delete.
(If you do not see the folder, tap Edit in the top-right corner to add it to your shortcut list.)
Tap the three dots (⋯) in the top-right corner.
Select Delete Folder.
Tap Delete to confirm.
The folder will be permanently removed from your Saved list.