The Android Auto split-screen update lets you use multiple apps simultaneously. Update the Android Auto app to start using split-screen mode. Here's how it all works.
New Android Auto features give car display a user design makeover
New Split Screen Android Auto Redesign Coming This Summer - CNET
User's Manual
Android Auto receives split-screen support on wide-screen head units
How do you flip the split screen in CarPlay or Android Auto?
How To Enable Split Screen On Android Auto
Google Announces New Features for Android Auto including Split-Screen Mode
Can Android Auto go full screen on the 10 display?
Google Makes Android Auto Split-Screen – channelnews
Using the phone projection function