Someone bought and installed a sound bar for the main TV. THANK YOU
If it is not working, here is how to set it up.
Look at the pictures below. The HDMI cable from the sound bar must be plugged into the HDMI-ARC of the TV. It is the bottom HDMI plug
On the TV to make sure it is set up to use it, click the gear button on the Vizio Remote
Then select ALL SETTINGS
Then select Audio
Then select Audio Out ATS 1080