Android 16 Makes Split Screen Easier on Smaller Screens
Stock Android added the concept of App Pairs back in Android 15. You choose two apps to use in split screen mode, add a shortcut to the paired apps to the home screen, and it's now trivially easy to trigger split screen multitasking (instead of having to perform multiple tap and drag gestures).
It sounds neat, but I never really used it, because on my small Pixel 9a, using apps in 50:50 split-screen mode is hardly user-friendly. There's just not enough room on the screen for each app to take up half of it and still be usable.