Nikon D4S - Manual (Page 76)

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To choose an AF-area mode, press the AF-mode button and rotate
the sub-command dial until the desired mode is displayed in the
monitor.
AF-mode
button Sub-command
dial
Monitor
A
Previewing Focus During Live View Photography
To temporarily select maximum aperture for an improved focus preview
during live view photography, press the Pv button. To return aperture to
its original value, press the button again or focus using autofocus. If the
shutter-release button is pressed all the way down to take a picture
during focus preview, aperture will return to the original value before
the photo is taken.