People have been requesting multi-monitor support ever since Bigscreen launched.
GOOD NEWS!
It's coming very soon. We're putting the final touches on the UI and UX, polishing the experience, and fixing some bugs. It should be out within two weeks.
Here's a GIF of multi-monitor in action.
Multi-monitor will require you to have multiple physical monitors or a cheap Headless Ghost ($15) dongle.
If you'd like to test multi-monitor before it launches, we'll be posting alpha tests to Steam. Join our Discord server to get notified when we post the alpha test.