I own Titans, and that's what I'm launching on steam. The actual support page doesn't seem to want to actually respond to me so I'm looking for information elsewhere. When the game launches, I see the Titans menu for about a second, before the game forcibly changes to the vanilla PA screen. The gameplay settings menu does not contain and options for anything other than changing the user interface. There is no way to change the expansion back after I set it to classic once to play with a friend. This is incredibly frustrating because I cant seem to do anything about it.
I'm not a game dev, but I have left a note for the support team. You can also try reaching out to them at support@planetaryannihilation.com and reference your support ticket number.
This is getting ridiculous. I've still gotten absolutely no indication from that team. How many people are on it? I know there aren't a million requests because the other posts on this page are months or years old.