Use the monitor’s physical brightness buttons or on-screen display menu
Open Windows Settings > System > Display > Brightness and color, then adjust the brightness slider
Use the keyboard brightness keys if your desktop monitor or keyboard supports them
Update or reinstall your graphics driver
Open your graphics control panel and increase display brightness
Check the monitor’s power-saving or eco mode and disable it if needed
Adjust HDR settings if HDR is enabled
Change the display profile or color settings if the screen appears dim
Clean the monitor screen to remove dust or smudges
Replace a failing monitor backlight if brightness is still low