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Page 15 in your owner's manual for the LG 27-inch 4K UHD IPS Smart Monitor with webOS and USB Type-C, Model # 27U731SA-W, under Parts and Buttons shows the joystick button located under the panel under the LG logo on the front bezel, and it shows you which direction to move the joystick button for Menu Control. You need to access the menu to navigate to Brightness Settings...^Ivan.
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