Sent from my SM-P600 using XDA Premium 4 mobile app
It's all the way at the very bottom of Accessibility. It is listed under Recognition. Turn it on. Then hold down the home button and and volume down to enter the wizard.
It should be helpful for when I do note taking at a meeting so I don't have to worry about touching the physical buttons. But for Button Savior Pro it disables the Home, Menu and Back so it's not something I can have on all the time. Plus the notification drawer cannot be interacted with anymore while this mode is on.