Probably, when you modify the rules when posting it? Before clicking play.
how are people creating 4pc max games?
I guess you would have to go through archive or a certain game you watched and click play. You can maybe save the game mode in "my templates" if that's not possible then you'd always have to go to an already finished 4PC MAX game. I see no other way.
its in the play menu over in 4pc.
i can't find it. can you post a screenshot?
in the 4pc teams menu go into edit rules, there are a lot of varints, i was looking for king capture and 4pcmax, didnt see it, but i see games in the lobby que once in a while. ill keep looking.

like this one https://www.chess.com/variants/custom/game/98214379
i don't have 4pc max option, neither ffa nor team (anyway i want play it just ffa)
i just can create normal capture the king games which are not rated, contrary to 4pc max games that have a rating