Android Auto split-screen support begins rolling out - 9to5Google

Those with larger or wide-screen Android Auto head units will soon be able to enjoy a dedicated split-screen mode that is rolling out.

Genius Hack Enables Android Auto Split-Screen in Unsupported Cars

Android Auto's split-screen redesign gets retooled and enters beta

So, Android Auto is broken again, but this is what you can try to

Some Android Auto users yet to receive the Coolwalk UI update

Android Auto - Wikipedia

Android Auto, finally with coolwalk for split view on apps : r/MachE

Android Auto redesign rolling out and getting WhatsApp calling

android auto Review: 'CoolWalk' revamped platform - 9to5Google

Android Auto News and Information

Samsung's on role: Galaxy A34 5G picks up its Android 14 One UI

How to Use Split Screen on Android Auto

Play Store embraces Wear OS, Android TV, and Android Auto

Survey finds customers increasingly reliant on CarPlay & Android

Google Shuts Down Android Auto, All Drivers That Need an Interface