For about two weeks or more between May and June 2020, I was able to cast my entire desktop screen to my Chromecast device and get the ability to extend my desktop (not duplicate it) to the TV where I've got my Chromecast device installed. I thought, finally the Google developers have added this much requested feature to the Google Chrome browser's cast functionality! This was extremely useful to me, because I effectively had two separate screens to arrange my windows on--double the video real estate. Although the mouse moved somewhat slowly on the second extended Chromecast screen (the one on the right in the screenshot below), the audio and video on the TV were well synchronized. Somehow, the feature no longer appears for me this week when I go to cast my desktop from the Chrome browser. How can I get this functionality back?
