Samsung Galaxy Note 4 - Manual (Page 58)

Motions & usability features
58
Multi window
An introduction
Multi window lets you run two apps at the same time in a split screen. You can also run
multiple apps at the same time in pop-up windows.
Split screen Multi window
Some apps, such as Calculator and Contacts, can only be launched in pop-up
windows when you drag them from the Multi window tray to the screen. Refer to
Pop-up Multi window for more information.
1
Tap and hold to open the Multi window tray.
2
Tap and hold an app icon and drag it from the tray to the screen. Then, drag another app
icon to the other window on the screen.
Apps marked with the icon can be launched in separate windows on the screen at the
same time. Tap an app marked with the icon and drag it to a new location to open the
app in both windows. To simultaneously launch the app in a pop-up window, tap the app
and .