Enable The Hidden, Experimental Multi-Window Feature In Android 6.0

Android (root): If you’re one of the lucky few to receive Android Marshmallow, and you have root, you can try out a hidden, experimental multi-window layout buried in Android.

This multi-window layout is extremely experimental, so this is your warning. Don’t do this unless you know what you’re doing. Google hasn’t officially announced this, it’s not supported, and apps will likely break. However, if you want to play around with it, here’s how to turn it on:

1. Use a root-enabled file browser to mount the “system” folder on your phone’s storage.
2. Open the “system” folder.
3. Select “build.prop” and open it with a root-enabled text editor (which most root file explorers should have built in).
4. On a new line at the bottom of the file, add the following line: persist.sys.debug.multi_window=true
5. Save the build.prop file and reboot your phone.

Now, you should have multi-window enabled. To activate it, open a couple of apps, and then tap the multitasking button. You’ll see a new icon next to the X in the title bar of the apps in the multitasking rolodex wheel. Simply tap this icon and choose where you’d like that app to go. The previous app in your list will fill in the other side.

Right now, this feature isn’t very robust, which makes sense. It’s not supposed to be activated by anyone outside Google. However, it’s there if you’d like to fiddle around with it.

How to Unlock the Hidden Multi-Window Mode in Android 6.0 Marshmallow [WonderHowTo]