I've been using Simple WP Membership Plugin for Sliders and Galleries for specific clients only and this worked well a long time.
But now with rife pro even if not logged in, the slider is shown public (every user, that opens the link for the album.
below the slider there is the info that you need to login and the link to the login page. but the slider doesn't care and is accessible / usable completely.
I´ve created one album to show that issue https://www.loveneverfails.photography/album/album-florian-viktoria/