Add Additional Display/Projector

Could anyone help me understand why I have two projectors, but on the display options (under screen configuration) my only options are "off", "window" or "display 1". I'm trying to set up a different display for the stage display, but that projector is not listed as an option. Thanks!

Please check your computer's display settings. It's likely that the second screen is not being picked up by the computer itself. In this case, you may need to try a different cable.