Is your feature request related to a problem? Please describe.
Now is not possible to delete a relation from several objects at the same time. If you want to delete a relation, you need to enter in every object, press the relation button, and then delete it.
Describe the solution you’d like
Be able to delete a relation from several objects at the same time. One way of doing this could be when you delete a relation from a set, instead of just hidding it, the relation will be deleted from all the objects inside that set.