Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 262)

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Adjusting the LCD Monitor Brightness
You can adjust the brightness of the LCD monitor to make it easier to view.
Under the [ 5 ] tab, select [Disp.
brightness] , then press < 0 >. Press the
< Y > < Z > keys to adjust the brightness on
the adjustment screen, then press < 0 >.
When checking the exposure of an image,
set the LCD monitor brightness to 4 and
prevent the ambient light from affecting the
image.