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You might be the owner of the List field via the Lists App. If that is the case, go to the Lists App and follow instructions to edit a List. Changes that you make to the List via the Lists App will be reflected within your Case Form automatically.
For all other fields
If you do not own the field, you cannot alter its name. If you want to change the details of the field, you must contact helpdesk@makerble.com to transfer ownership of the field to you.
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