Thanks to a toggle within the Developer options section added back in Android 12 you can force split-screen mode even for unsupported apps on your Android phone (or tablet).

Google is working on a triple split-screen multitasking system for Android tablets inspired by OnePlus. A code named 'flexible split-screen mode' was found in the Android 16 developer preview ...

However, Android Auto is evolving at a fast pace, and an announcement released last year at Google's I/O developer event indicated that a full-screen mode would eventually be required.

All of this, however, is speculation at the moment and can be attributed to a code snippet named ‘flexible split-screen mode’ that was found on the Android 16 developer preview 2 by Android ...

Currently, Android 15 offers a limited number of developer settings that allow users to adjust their external monitor experience, though these changes aren’t real-time and are still more ...

Android 16 Developer Preview 1 brings a handful of user-facing additions, but nothing major so far. On the Pixel 9, there’s an “Experimental mode” display color.