How to switch off this additional app panel? [see screenshot]

[ghostobzen]

Guys, I cannot find where can I switch off this annoying app panel on Note 2 - the one on the right hand side.
Any help will be appreciated!!!

 

[gabixav]

Press and hold the back button for a few seconds.

 

[ghostobzen]

Dude!!! Love you, man!

 

[jdub1981]

You understand what that panel is right? Its not an "additional app panel" as you put it.

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[jdub1981]

Dude!!! Love you, man!

Sent from my SAMSUNG-SGH-I317 using Tapatalk 2

 

[SpookDroid]

Yup, that's the 'multi-window' bar... long press the 'back' button and it appears; you can use two supported apps in two different windows (split-mode). Long press again and it goes away (along with the background app, leaving you with the fore app full screen).