How to adjust Display Brightness in Samsung Galaxy Grand2(SM-G7102)?

a). Tap on Apps icon as shown below.

b). Now tap on Settings and then tap on Device as shown below.

c). Now, tap on Display option as shown below.

d). Tap on Brightness option as shown below.

e). Now tap on Check box in front of Automatic brightness and disable it as shown below.

f). Drag the leveler Bar icon according to the suitable brightness level on screen.

g). Now, tap on OK as shown below.