2016~2021 How do you return to the home screen from Android Auto?

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CX9
Google Play prompted me to update Android Auto on my Pixel 3 phone recently and I did. Then when I connected the other day to my 2019 CX-9 GT with a USB cable and was playing Amazon Music and using Google Maps I wanted to go back to the Mazda home screen and couldn't get AA to quit. Previously if I hit the Home button, Nav or Music console buttons it would take me to those screens and AA would relinquish control of the infotainment system. Since this update however the only way I can get it to let me return to the Mazda screens is to unplug the USB cable. Has anyone else experienced this and discovered a different method? Thanks.