Is your feature request related to a problem? Please describe.

On a new website I'm building, we have two frontend user groups. Each group requires its own set of custom user fields.

For articles, it's possible to assign custom fields to specific categories—those fields only appear when editing an article in that category. I was hoping for similar functionality with user groups, but discovered this is currently not supported.

While we can use access rights to control the visibility of user custom fields on the frontend, there is no such control in the backend.

As a result, when editing or creating a user in the backend, all custom fields (or their field group tabs) for all user groups are shown. This creates confusion when managing users from different groups, especially when each group should only see its own relevant fields.

Describe the solution you'd like

I would like the ability to assign custom user fields (or field groups) to specific user groups.

In the backend user manager:

• Only the fields assigned to the user's group(s) should be shown.
• This should work similarly to how custom fields behave with article categories.

This would make backend user management much clearer and more context-aware.