The app you are looking for is , developed by Eric Tsang (etsang) . It was specifically designed to restore the long-press shortcut for multi-window mode that was removed in newer Android versions. Download Options
: You can find the source code and project details at the ericytsang/app.android.multiwindow repository.
You can download the APK or install the app directly from these official and reputable sources: The app you are looking for is ,
: After installing, you must enable the app's Accessibility Service in your phone's settings for the shortcuts to work.
: Can also be activated via a dedicated accessibility button or a persistent notification. Compatibility : Designed for Android 7.0 and higher. Quick Setup Guide You can download the APK or install the
: Open the app to select which button (Home, Back, or Overview) will trigger the split-screen action.
: Allows you to toggle split-screen mode by long-pressing the Home , Back , or Overview (recent apps) buttons. Quick Setup Guide : Open the app to
: Long-press your chosen button while an app is open to instantly enter multi-window mode. ericytsang/app.android.multiwindow - GitHub