Nikon D5200 Reference Manual page 24

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Hiding Shooting Information
To turn the monitor off, press the R button. Note that the monitor turns off automatically
while the shutter-release button is pressed or if no operations are performed for about 8 s
(for information on choosing how long the monitor stays on, see Auto off timers on page
160). The information display can be restored by pressing the R button again.
R button
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See Also
For information on choosing a design for the information display, see Info display format
(0 169). For information on choosing whether information is displayed when the shutter-
release button is pressed, see Auto info display (0 171). For information on the indicators
displayed in live view, see page 97. For information on available settings, see page 221.
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Information display Monitor off