How to adjust the sensitivity of Nikon d5600?

Use the I key to enter the ISO setting interface and select on the LCD. Please refer to page 107 of the instruction manual for details.

Nikon SLR's "automatic ISO sensitivity control" is a very useful function, which can set the starting conditions according to the lowest shutter speed and the highest tolerable sensitivity of this machine. Once the shutter speed of automatic exposure is lower than the critical value, the ISO sensitivity will be improved, and the sensitivity will not be set too high to affect the film quality. See page 228 of the instruction for details.