Auto start game
Game creators can control whether or not their games automatically start or not once all players join.
By default, games start when everyone joins or declines and all open seats are filled. If the game creator disables auto start, the game will not begin until they click the Start Game button in the lobby.
If you create a game without automatic starting, it will appear on your My Games with a message next to it indicating that the game is waiting for you to start the game.