Multitasking button, help?

[AlfieBriggs]

Hi, I want to make my more button (don't know proper name) like the S5 to bring up the multitasking windows I am rooted so is there any way?

Posted via my Note 3 running KitKat 4.4.2

 

[Golfdriver97]

Is there a different action if you long press it?