Samsung Galaxy Note 4 - Manual (Page 52)

S Pen features
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Air view
Hover over an item on the screen with the S Pen to perform various functions.
Previewing information
Point at the screen to preview content or view information in a pop-up window.
Using Air Button
Hovering the S Pen over items in some apps, such as Gallery and Video, will display Air
Button on the preview window. You can perform various actions directly from the preview
window using Air Button.
Air Button
If this feature is not activated, open the All apps screen, tap Settings → S Pen → Air
view, and then tap the Air view switch to activate it.