To get the answer to this question, its not possible to control monitor brightness with software as the monitor is programmed to operate only with buttons.
However, you can adjust the brightness settings in the Action Center just by pressing the Windows key + A.Use the brightness slider to adjust the level.
The further right the slider, the brighter the screen.
If you don't see the icon, press Windows key + I, go to System > Notifications & actions > Edit your quick actions and click Add > Brightness > Done.
Hope this helps! Keep me posted for further assistance.
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