From clock face, scroll right (swipe left) until get to 'Settings'; tap that and I think at the top is 'Brightness'; tap to switch among Dim, Normal, or Max. I think Normal automatically adjusts to ambient light level.
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@MLGar wrote:From settings I go to brightness which shows DIM, I tap on DIM to make brighter but nothing happens
Selecting "DIM" makes it dim.
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