Adjust The Display brightness

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 Go to start>>>control panel(classic View)>>>power options(double click)

Or just type "power options" in the start menu search to bring up the power options.

The power options will open>>click on the "Adjust the display brightness" see the picture below.

From there you can adjust the brightness for On Battery if your system uses battery like notebooks and laptops. You can also set for Plugged or even both.

Click the save changes when done.