To view all open Word documents in a single parent window sharing a common set of menus and toolbars, navigate to Tools, Options, View and in the "Show" section, clear the checkbox next to "Windows in Taskbar".
Click View, Full Screen, to view your documents without the clutter of screen furniture such as menus and toolbars (point mouse to top of screen to view menus).
Press Esc or click Close Full Screen in the Full Screen box to exit.
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