Two amazing apps – Dimmer and Monitorian let you control the brightness of your external monitors. If the above methods do not suit your needs, third-party apps always come to the rescue.

In case Windows 10 Night light doesn't work, check its 3 alternatives. Tip: You can enable or disable the Night light from Action Center as well. In case you don't like how the screen looks, click on the Turn off now button to disable the Night light. Tip: Check out the top 120Hz gaming monitors that you can buy. If the monitor buttons aren't working, you find them difficult to use, or the buttons aren't available, use the next two methods. We would suggest you read your monitor's instruction manual to know how to access the customization menu. The on/off power button also acts as a controller on certain monitors. On some monitors, you will find a tiny joystick at the bottom of your monitor that can be used to access the menu and eventually control the brightness and other parameters. You can control different monitors in different ways. The first method involves taking the help of button controls on your monitor itself to change the brightness. These solutions will also come in handy if you are using a multi-monitor setup.

That's where the following methods will help. When you connect an external display, the regular way to control brightness are either greyed out or do not do anything for other monitors, be it second, third, or fourth monitors.

Brightness setting not working