Board Game Arena

When searching for a game, I can select 3 or 4 players, but I can't find how to make it flexible. Please help.

I was expelled while trying to play Merchant, trading with it and stealing a metropolis. Other players had previously made trade offers that I had to reject, costing 1-2 seconds each time. Then when it was my turn, I lost a few seconds every action because I had to confirm every action with a specia...