How do you mute games in which you've surrendered or were eliminated? This is mostly for diplomacy games.

You can't or you mute all other games with unread chat too. That's even more annoying if you get an invite to a long game, decline but still get the messages for this game you aren't even in and it shows the game on your games.

Yes, this is quite annoying. It is fine if you set your Open Games to not show games you are eliminated in or that are over, but if you become an AI, you still receive chat. This would be something that would be nice to have fixed.