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As of right now, the only way to delete the problem list is very tedious and you have to go one by one. It would be great to be able to delete multiple/all items from the problem list.
This already exists. Anyone with management level access can bulk manage the problems list (any of the free type cumulative lists actually).
FAQ on list management: https://forum.smartflowsheet.com/support/solutions/articles/13000079197-how-can-i-manage-and-clean-up-freetype-drop-down-lists-