How do I disconnect Android Auto voice so my head unit voice (Subaru StarLink) can play audio from

How do I disconnect Android Auto voice control so I can request my native head unit voice control (Subaru StarLink) to play a radio station or play audio stored on a USB drive?
https://www.androidcentral.com/android-auto-basics states
"And if you want to listen to the factory radio (terrestrial- or satellite-based), you can do so while still using Android Auto."
BUT it does NOT tell you how to do this. The Android Auto screen option to "Return to Subaru" does NOT release voice control. I have found NO voice command that releases voice control to my head unit. My only option is to unplug the USB cable connection to my Android phone which kills all the great things in Android Auto (Google Maps, Phone Calling, Text Message receive/response).

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