@poletouche Did you also enable the "Show accent color on title bars..." option?
Also note that the selected color only applies to active windows. As far as I can tell, the inactive color is determined by Windows (i.e., the theme you choose).
I'm sure it's not the color of Windows, because when I turn on this option, the titlebar will display blue, and when I turn it off, it will be black
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It's blue because you have blue selected above the checkbox in your screenshot.
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