colors – Full dark-mode in Microsoft Word (2016): dark page background

With dark theme mode in Windows 10 the Office Word background stays white.

Without changing the color of the text background in a Word document while writing and reading there is no “dark mode” feel as the white background fills the view.

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I am looking for some time for this feature that is available in LibreOffice under Tools-Options-Application colors

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I am posting this in order to provide the answer.