In order to capture whole screen at once, you need to just press Windows Key + PrintScreen or Windows Key + Fn + PrintScreen key combination on keyboard. (thewindowsclub.com)
For example, although we added zoom levels to handle high DPI more gracefully, when zooming you won't be able to see the VM's whole screen without scrolling. (neowin.net)
eXtra Buttons allows to expand any window of any application so it occupy whole screen. (xtrabuttons.com)