17.3-inch diagonal HD+ BrightView WLED-backlit display (1600 x 900)
Digital flat panel screens only look their best at "native" resolution. In your case, 1600 x 900. And the refresh rate is "virtual". There is no refreshing like you used to have on old tube monitors: 60 hz is kind of a placeholder. So to answer your question directly, your screen should be set to 1600 x 900 and any adjustment you want to make in appearance should be done by scaling in the WIndows display properties.
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