Open Settings
Click System
Click Display
Under Brightness and color, move the Change brightness slider to the left
Press Windows key + A
Use the brightness slider in Action Center
Press the brightness keys on your keyboard
Use Fn + brightness key if required
Open the battery icon menu on a laptop and adjust brightness if available
Open Control Panel
Click Hardware and Sound
Click Power Options
Click Change plan settings
Adjust the screen brightness slider
Open Mobility Center by pressing Windows key + X
Select Mobility Center
Move the Display brightness slider to the left
Update your display driver if brightness controls are missing
Restart the computer if brightness changes do not apply