Can I close the app and do something else with my device while I am casting?

Yes, you can minimise the app and let it run in the background. You can then use your device for whatever else you would like to do with it. The stream will continue playing on your TV. When your device is locked you can still control the program by using the locked screen control. It’s also possible to use the notification control. Just swipe the screen (depending on the device from top to bottom or bottom to top) to open it.