Here's how to adjust screen brightness and other display settings (e.g., Sleep, Font size, etc.) for your Tab 4 8 PLUS.
Perform any of the following:
Adjust Brightness Settings
Tap
Brightness level
then slide the
brightness bar
left or right to adjust brightness.
Tap the
Adaptive brightness switch
to turn on or off.
Tap the
Sunlight Visibility Improvement switch
to turn on or off.
Adjust Display / Font Settings
Tap
Night Light
then select the preferred settings.
Tap the
Back arrow

to return to the Display screen.
Tap
Advanced

to configure the following additional settings:
Sleep (e.g., Never, 15 seconds, etc.)
Screen saver
Ambient display
Notification light options
Tap the
Back arrow
to return to the Display screen then tap
Advanced
.
Slide the
Font size bar
left or right to adjust text size.