Windows 11 laptops and computers will automatically adjust the screen brightness according to the current lighting conditions. This helps users reading easily and comfortably in Windows 11 screen. But if you don’t want the auto adjustment of your screen brightness on your Windows 11, there are some easy ways to change your screen brightness on your Windows 11. You can manually adjust the screen brightness based on your needs. Let’s have a quick viewing on how to change screen brightness on Windows 11.
Change Screen Brightness via Quick Settings
The quick settings of Windows 11 help users to do some settings quickly. It can help you quickly access to the settings of Windows 11.
Click the Quick Settings button in your taskbar, which is a hidden button located where you see your Wi-Fi, Speaker, and Battery icons in the far-right corner.

Then the Quick Settings will pop up, drag the circle on the brightness slider next to the sun icon to adjust the brightness of your screen.

Change Screen Brightness via Windows Settings
You can also change your screen brightness via your Windows settings. First of all, press Windows + I keys to open Settings window, and then select Display.

Scroll down to Brightness & Color, under Brightness, drag the circle on the brightness slider next to the sun icon to adjust the brightness of your screen.

Why the brightness slider is greyed out?
If you are using external monitor on your laptop or computer, you may find your brightness slider is greyed out. You are not allowed to adjust the screen brightness on your Windows 11. In this case, need to use the physical buttons located on your monitor to change the screen brightness on Windows 11.