I also found that out today. I have been steaming it to the tv using the whole desktop option, but it seems to be slightly choppy and the sound still comes out of the laptop.
When you click the Google Cast icon in the browser, there is a little down arrow in the very top right of the box that appears. The bottom option is "cast this screen".
I also found that out today. I have been steaming it to the tv using the whole desktop option, but it seems to be slightly choppy and the sound still comes out of the laptop.