To see the Mac desktop and the virtual machine desktop at the same time, switch to Single Window view.

In Single Window view, the virtual machine appears in a single window that you can resize and move with the mouse.

Switch to Single Window view.

In Full Screen view with the Full Screen title bar, select View > Single Window.

In Full Screen view without the Full Screen title bar, use the keyboard shortcut Command key+S to switch to Window view.

In Unity view, use the keyboard shortcut Command key+S to switch to Single Window view.