BuddyPress.org

Did you try searching the community?

This thread might be worth you reading , it will allow you to make the site completely private to all but registered logged in users, or a variation on ‘All’ if you wanted to show certain pages.

https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/how-to-make-a-private-community/?topic_page=2&num=15#post-44616