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If you just want to make sure that your users' case lists are clear you can Reassign Cases. However, forms are always associated with the user that submitted them, so if you reassign a case from User 1 to User 2 and then delete User 2, the case will no longer show up in any case list, but the forms will still show up when you search from User 1's submit history.
- When you move cases to a new user, you are ONLY moving the "case"– not the individual form submissions. It is strongly recommended that you NOT delete any "old" users if you want to be able to do any sort of data analysis. Individual form submissions will always remain linked to the user that submitted them–even if that user is no longer active. If you want to hide an old user's data you can "deactivate" the worker under the "settings & users" section of CommCareHQ.
- It is not possible to directly delete a form.