BuddyPress.org

Hello!
(I use Youzer but it based on a BuddyPress and their support are useless.)
I already restrict access for all users to a WP dashboard profile (only frontend are accessible). How also restrict users with lowest auto-set on registration role “Subscriber” to access their Youzer/BuddyPress profiles and groups pages etc? (Best of all at low-level via functions.php etc to avoid any hacking.) So user will able to access all WP frontend activity functionality like posts comments, in-post voting, WooC products purchase, etc, but without access to a dashboard and to Yz/BP profiles and social network activity.