If the Windows 10 brightness slider is missing, you may be stuck with an improper level. · The reason for this problem might be a problematic. Press Windows key + I to open Settings. · Go to System > Display. · Beneath Brightness and color, use the Brightness slider. To the left will be. With Win10 Brightness Slider, you’ll easily manage your screen’s brightness while also capable of adjusting the brightness of several.
 
 

Windows 10 Brightness Slider Not Working {Fixed} | TechPout.Win10 Brightness Slider Free Download for Windows 10, 8 and 7 –

 
The 2 method really really really saved my life! Under Brightness and color, look for the Change brightness automatically when lighting changes check box, and then select it to use this feature. WBFS Manager.