BuddyPress.org

I had the same problem and was hunting for a solution only yesterday. After much searching and trying various plugins (some VERY old and inoperative) I found this very new one:

Private BP Pages

Just use that text as the search text for ‘Add New’ from your WP plugins page.

See my review here

https://wordpress.org/support/view/plugin-reviews/private-bp-pages

The edit I mention is important. Seems to work fine but I need to do more testing.