This article explains two ways to turn off a Chromecast device. It also includes information on how to disable Chromecast network notifications and how to stop casting to Chromecast.
Chromecast with Google TV 4K: How to turn it on and off [3-way]
Chromecast devices do not have an on/off switch. They are intended to be used as an always-on device, with a home screen that displays on your TV screen when the device is not in use. Some people may not want to use the always-on screen, or they may not want the Chromecast device to appear on your home network when it is not in use.
There are a couple of ways to turn off a Chromecast device. One of the methods below will work to turn off Chromecast devices so that they are no longer connected to your Wi-Fi network.
The easiest way to turn off a Chromecast device is to disconnect it from the power. Chromecast devices come with a power port that you plug the wall charger into. Removing the charger from this port will turn off the Chromecast device.
