One of our popular volley types on the desktop app is a screen recording volley. While we are working on the functionality to be able to see your screen and your face at the same time on a screen recording volley, we aren't quite there yet. But, dust off your old friend Zoom to get this to work in the meantime :)
Bonus for Mac Users:
You can use QuickTime Player to accomplish the same thing.
Bonus X2: Zooming while screen sharing
Now, while holding the modifier key (Control by default), you can use the scroll wheel on your mouse to zoom in and out of your screen
Note: The zoom and PiP feature will only work when you are sharing your entire screen