What is App pair feature in Galaxy Note8?

Add two frequently used apps, such as a video player and a messenger app, to the Apps edge panel to launch them together in a split screen view with a single tap.
 

Drag the Edge panel handle →  → CREATE APP PAIR → Select apps → DONE  

Pictorial representation of the above settings are as follows :  

 
1. Drag the Edge panel handle towards the center of the screen. Swipe to the left or right to open the Apps edge panel.

 
2. Tap  icon and then tap CREATE APP PAIR.

3. Select two apps to from the list. The first app will appear at the top and the second app will appear at the bottom when opened in split screen view.

 
4. Tap DONE.

 
5. After creating app pair, you can launch 2 apps at the same time.

CLICK HERE to know about customize edge lighting color in Galaxy Note8 (SM-N950FD).