Reply To: filtering private forums from [bbp-forum-index] shotcode
Those are hidden forums.
In bbPress a private forums posts should only show if the user is logged in. If you have a BuddyPress group and it is private the posts should only be visible if the user is logged in and a member. The users are able to see the title of the private group that may want to join.
IF you want, change to a hidden group where only members can be invited to the group to see the content. You should be able to keep it as a private forum as well.
Make sure to run the repair tools one at a time after you have made your choice on what you want exactly. The repair tools are in Tools > Forums. I know there is one exactly for BuddyPress Groups and one for private and hidden forums, but just running the repair tools once in a while is not a bad thing to do.
