To configure the number of deck players displayed in Decks Mode, go to File > Settings and click on the Decks Mode tab. In the Number of full row decks selection section, use the up/down arrows to select how many full row decks you want displayed. While there's no limit to the number of decks you can select, you are limited by your screen resolution.

Each deck can also be assigned to a different audio device (typically a sound card) on your computer using the dropdown menu. This allows you to assign each deck to an individual fader or channel on a professional mixer.