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You should see the screen slowly and smoothly dim and shift contrast. To simulate the effect, go into a dark room, and open Microsoft Word (or anything with a white background) then switch to an app that is all black like Settings (if dark mode is enabled). The effect is most noticeable at night when you tend to have a lower display brightness because you're in a dark room. The feature is standard on modern TVs and high-end gaming monitors, but it can also be a source of frustration for some.
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