The update pushed since 5/20/25 ~9 pm CST has removed the server list from opening. The sponsored servers no longer show “Join to open server list” and the server list does not appear when a server is joined.
This prevents playing on a personal server from a Switch running the current version with no way to downgrade versions.
You can change your DNS settings for you internet in the console settings in some way (look it up, I can't remember). No guarantee it'll work, though.