Hi Matthias,
Sorry for the trouble! This is something we'd like to take care of as soon as we can after the 4.0 release. Most people find they can't undeploy a form without having to fiddle directly with data in the database. Once we have this capability in Form Builder (i.e. when viewing a form in Form Builder, to be able to undeploy it), we also need to make that for published forms, you can only save it under a new name, but can't rename it, as this would get you in that situation where you have a published form for a given app/name, but no corresponding editable form.
I also took a few notes about this on the issue linked below, so we don't forget about it when the time to implement this comes:
Alex
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