Multi Monitor Support allows you to arrange screen elements spread over 2 or more monitors connected to the Booth computer. This can be used in many ways to place a live view on 1 monitor with image previews on another or controls on one touch screen while placing the live view on a large TV facing the user. To set up in the screen template select the Edit Screen icon in the lower left and check the box for "Extend to multiple displays". Then you can either choose Custom and type in the combined width and height of the monitors or from the template size drop down choose "Combined area of all monitors" (see below). In the template screen you will see the full extended screen where you can arrange template items as needed

Here is a sample template you can download for free to see how that works Multi Monitor Template

Here is a screen shot of the sample template above using two monitors, one above the other.