BuddyPress.org

I tried to implement the following code:

function buddydev_hide_members_directory_from_all_except_admin() {

	if ( bp_is_members_directory() && ! is_super_admin() ) {
		//should we add a message too?
		//bp_core_add_message( 'Private page.', 'error' );
		bp_core_redirect( site_url('/') );
	}
}
add_action( 'bp_template_redirect', 'buddydev_hide_members_directory_from_all_except_admin' );

in plugins> bp-custom.php. Just in case, I also tried to implement it by creating a new plugin folder > bp-custom.php in the child theme, but the member directory page is still visible to non-admin/non-logged in users.