Data-Driven Properties Dialog
Settings that we have made can be visually cleared with the "Default" button, but the functionality is retained and remains hidden.
You can only delete the entire category (or set other functions) if you don't want it to behave as it did before.
(I would rather expect that as soon as a form has been emptied, the category also loses its data-driven specialization,
and that you can then transform it into a normal category or whatever.)