While you're connected to a Switcher Video Chat room, you or your remote guests can share their Mac/PC screen when using a compatible browser. Screensharing this way is also a great workaround if you are experiencing any issues with Switcher Cast.
Compatible Browsers for Screensharing with Remote Guest Video Chat
Screensharing through Remote Guest/Video Chat
Once you are connected to a Video Chat room, click the screensharing icon (looks like a monitor) at the bottom left corner of the screen.
Select the screen or application you would like to share. Some browsers, such as Safari, will only share the entire screen.
To stop sharing your screen, simply click on the screen sharing icon again, or select "Stop Sharing" on browsers that present that option.