Crossplay

Crossplay servers are launched with -publiclobby and CrossplayPlatforms=(Steam,Xbox,PS5,Mac). Console players (Xbox, PS5) can only join community (public-lobby) servers, and do so via the in-game server browser rather than a direct-connect string.

Where these live in the app

Two separate controls, and both matter:

• Public lobby is the switch in the Create server dialog (see Your First Server). It’s off by default. It’s what adds -publiclobby to the server’s launch, which is what puts the server in the in-game community browser at all.
• CrossplayPlatforms is an ordinary key on the server’s Settings tab, in the GENERAL section. Its default is (Steam,Xbox,PS5,Mac), so a public-lobby server accepts every platform unless you narrow that tuple yourself.