Cast your Android screen from the Google Home app
Casting your Android screen lets you mirror your Android device to the TV so you can enjoy your content exactly as you see it on your mobile device—only bigger.
Step 1. Get started
Important: The "Microphone" permission in the Google Play Services app needs to be turned on to successfully use the "Cast Screen / Audio" feature with Chromecast. If you don't have this permission turned on, the Cast Screen session will immediately disconnect after trying to connect.
To turn on microphone permissions:
Step 2. Cast your screen from your Android device
Step 3. Adjust the volume when casting your Android screen
Step 4. Stop casting your screen from your Android device
From the Google Home app