Hi Ian

I tried applying a course creator type role to a category to allow creation of courses for selected categories and then went into the course catalog and all courses were visible.

Audience visibility does affect what appears in the course catalog. It sounds like you have an audience included in audience visibility setting that the course creator isn't part of.

Is it possible to add these course creators as members of the audience visibility audience? Your partner may have a reason for setting up the audience visibility the way it is.

Regards