Once your Matter-enabled device has been successfully paired and appears in the Google Home app (GHA), test control of the device by different methods:
Use Google Assistant to toggle the device state from voice commands.
See the Control smart home devices with voice commands section of Control smart home devices added to the Google Home app for example commands.
Google Home app
Toggle the device state from the GHA.
See the Control devices with the Google Home app section of Control smart home devices added to the Google Home app for more information.
Toggle the device state from the device panel of a display, such as the Google Nest Hub (2nd gen).