If you have a Google Home device, you can delete it by going to the “Settings” menu and selecting “Delete device.” If you don’t have a Google Home device, you can also delete it by going to the “Google Home” app and selecting “Delete.”

Open the Google Home app on your phone or tablet. Tap the Menu icon in the top left corner of the screen. Select More settings and then tap on Settings in the row that appears across the top of the screen.

Remove Duplicate SmartThings Devices from the Google Home App