Menu, settings, my device, motions and gestures,, air gesture, quick glance slider to on

 

Hi philsworld, and welcome to Android forums!

I believe this is accomplished by going into settings, clicking on "my device", and then choosing the "motions and gestures" setting, then make sure that you set the "air gesture" toggle to show the green "on" position.
I hope that helps you.

 

And the device has to be on a flat surface, it won't work while you're holding it.