Use the brightness keys on the keyboard, usually the sun icons on the F keys
Press the Fn key together with the brightness down key if needed
Open Display or Brightness settings in your operating system and lower the brightness slider
On Windows, go to Settings > System > Display and adjust Brightness
On Mac, go to System Settings > Displays and lower the brightness
Use the Action Center or Quick Settings brightness slider on Windows
Turn on battery saver mode if it reduces screen brightness automatically
Disable adaptive brightness if it keeps changing brightness automatically
Use the laptop’s control center app from the manufacturer if available
Update display drivers if brightness controls are not working
Restart the laptop if the brightness setting is stuck