You can download the APK or install the app directly from these official and reputable sources:
: You can find the source code and project details at the ericytsang/app.android.multiwindow repository. 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. You can download the APK or install the
: After installing, you must enable the app's Accessibility Service in your phone's settings for the shortcuts to work. You can download the APK or install the