How to get the Apps Shortcut like the Note 4 ???

[AC Question]

Hi ,

I play alot of game on my phone.

I had the Samsung Note 4 for a long time, till i wanted to upgrad for the Note 5.

The problem is , when i play i used to press the BACK Bottom to get my apps shortcut , and open them in Windows Mode automatactly.

Now the problem with the Note 5 is i can't do that anymore, i have to go back to the main screen , start the apps like Chrome or Facebook, and then hold the Right Corner to windows it..

Is this a way to get back this Back Buttom and have all my apps that can be windows in a bar on my right screen??

Thank you