Android 15 QPR1 Beta 1 is rolling out with a new developer option to enable desktop mode on secondary displays. This replaces the old “force desktop mode” option in previous versions of Android.

Android 16’s desktop mode lets Pixel phones power a desktop-style workspace on an external monitor, with resizable windows ...

Android’s hidden Developer Options can supercharge your phone with features like faster animations, improved Bluetooth audio, file transfer defaults, fake GPS location, background app limits, and ...

In a nutshell: Google has been working to bring a "proper" desktop mode to Android for quite some time. The feature was first introduced in 2019 with Android 10, but it wasn't intended for end-users.