Have an app on your computer that you want to broadcast in a room?
You can use the Screen share button on the left side of the bottom toolbar to pick the screen or specific window you'd like to share. 
In a Switchboard room multiple people can share their screens at the same time!
In fact, you can share several different windows from a single computer at the same time. 🤯
If you are having trouble sharing your screen, check to make sure your browser is updated to the latest version.
*Safari users: Safari only allows you to share the entire "current screen", so you won't be able to select a specific app or display to share.