In the View menu, you can choose between Unity, Single Window, and Full Screen. In full screen mode, the Dock only appears when the mouse as at the edge of the screen where the dock is set to be ...
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In the View menu, you can choose between Unity, Single Window, and Full Screen. In full screen mode, the Dock only appears when the mouse as at the edge of the screen where the dock is set to be (default=bottom) long enough. A brief move of the mouse to that edge doesn't bring up the Dock instantly as it's designed to function as if a full Guest environment first (operate as if the screen is only running Win 8.1). You say "suddenly Win 8.1 started using the whole screen"—does this mean it changed to full screen mode on its own? There's no keyboard shortcut to produce that. At least in Fusion 6 (which may also be the case in 5), even if you have your Mac to always show the Dock, full screen mode on the Guest will hide the dock so that the Guest may appear as if it's the only thing there. It moved the Dock out of the way, but as you said, you can still get at it if you need it. Command-Tab can help you select another (Mac) application and move to a different Mac Space (a Guest VM will occupy its own Space in full screen mode). Also in the View menu are options for the Full Screen Minibar (always show, always hide, or hide/show based on mouse entering) and you can also uncheck "Hide Menu Bar in Full Screen" (shift/command-M).
