Playing Switch Bedrock without Cross platform help

I'm trying to find a way to play online with my Nintendo Switch Friends without having to do the Cross-Platform, because I want to use the Mario Mash-up pack on my server for my Switch friends.

But Everywhere I look, there's no option to select Switch Friends only on the settings, and thus cannot use the Mario Mash-up Pack because its not allowed to use for Cross Platforming, but I don't want to do Cross Platforming.

How do you disable it?