Using Stage to Preview

Any production element can be previewed by placing it in the Stage prior to taking it to air.

To Stage an input or clip:

Press and hold the Stage/Preview button in the bottom-right of the assignable button area of the Control Surface.
Hold the Stage button.
Select an input or clip either from an assignable button or from the menu on the Touchpad..
That input source or clip will be displayed in the Stage monitor.
Press the Take button on the Control Surface to put the staged source to program to air using the primary transition.