Not being able to change the brightness of your screen from the taskbar or the Notification Center is a big inconvenience for Windows 10 users as they would alternatively have to search for brightness settings deep inside the Settings app each time they have to change the brightness of the screen.
RECOMMENDED: Click here to fix Windows errors and optimize system performance There are a number of ways to change the screen brightness in Windows 10. Changing the brightness is also important if you are changing your environment from a room in your office to outdoors on a sunny day. If you are working a lot in front of your computer, an incorrect screen brightness level can cause eye strain and drain the device battery if it's not running on an AC power source. Having the correct screen brightness is very important.
Manually Adjust Brightness Windows 10 Pc.
If that's the case, remove Teamviewer and similar software from your PC and check if that solves the issue. Missing brightness slider Windows 10 – Being able to control your brightness using a slider can be quite useful, but many users claim that this feature isn't available.