If you're using an Android device, you can not only cast Chromecast-enabled apps, but you can also cast the entire screen of your Android device to your TV right from the Google Home app. This feature does not work on iOS or Windows devices.
Here are the steps on how Chromecast.com/setup on Android screen to your TV.
Open the Google Home app.
Tap the Accounts tab.
Scroll down and tap Mirror Device.
Tap Cast Screen/Audio. To use this feature successfully, you need to turn on the "Microphone" permission in the Google Play Services app.
Finally, select your Chromecast device. Done! You can now mirror your screen to your TV. Tap Disconnect to stop.
Follow the simple steps below to cast directly from your app on Android.
Make sure your Android device is connected to the same Wi-Fi network as your Chromecast.
Tap a Chromecast-enabled app. Make sure the app is up to date. You can find it on the Google Play Store.
Tap Send.
Select the device you want to transfer to, then tap Cast. Now done.