Depending on whether the current game is already a quiz game or not, you can start a new quiz in the following way:

1. If the current game is not a quiz game, you can find the command "New quiz game" in the menu of the title bar as well in the app bar. The command is blocked, however, if you are playing online or when you control more than one player. If you click the command, either the current game will be performed as quiz or a new game will be launched as a quiz. The current game is only used if it was never played further than up to licitation.
2. If the current game is a quiz game, you can just press this button on the app bar.