How to hide attachment categories for a specific form type?

2

Hello,
I have a process containing multiple form types. I configured an optional attachment attribute called Category, with its values provided by an SQL data source.
The SQL query returns attachment categories only for one specific form type. For the other form types, the query returns no rows because I do not want to use attachment categories there.
However, on those other form types, WEBCON still displays the attachment group “None” for attachments without an assigned category.
My expected behavior is:

For form type A: display the configured attachment categories.
For form type B: do not display any category or grouping at all. Attachments should be displayed normally, without the “None” group.

Is it possible to conditionally disable or hide the optional attachment attribute depending on the current form type?
Alternatively, is there any supported way to hide the “None” attachment group when the category data source returns no values?
I would prefer to keep both form types in the same process and avoid using a technical default category such as “Attachments”.
Thank you in advance for any suggestions.