Nikon D3200 Reference Manual page 6

To display images in "contact sheets" of four, nine, or 72 images, press the q=_ (?)
button.
Full-frame
playback
TO Use
Display more _[] (?)
images
Display fewer
images
Thumbnail playback Calendar
playback
Description
Press q_: (?) button to increase the number of images
displayed.
Press _ button to reduce the number of images displayed.
When four images are displayed, press to view highlighted
image full frame.
Use multi selector or command dial to highlight images for
Highlight images full-frame playback, playback zoom (_ 104), deletion
(_ 106), or protection (_ 105).
View highlighted Press _) to display the highlighted image full frame.
image
Delete
highlighted _ See page 106 for more information.
photo
Change protect
status of
AE-L
A_-L ( O--n) See page 105 for more information.
highlighted
photo
Return to Press shutter-release button halfway. Monitor will turn off;
shooting mode photographs can be taken immediately.
102