Nikon D5500 - Manual (Page 35)

11 Introduction
A
Turning the Monitor Off
To clear shooting information from the monitor, press the R button or
press the shutter-release button halfway. The monitor will turn off
automatically if no operations are performed for about 8 seconds (for
information on choosing how long the monitor stays on, see Auto off
timers on page 253). The monitor will also turn off if you cover the eye
sensor or look through the viewfinder.