Firstly (assuming you are using Ubuntu with Unity), an option exists to toggle the Menubar under the View menu. The right-click functionality you mentioned also exists when right-clicking on the breadcrumbs bar or App Menu.
Secondly, Bug #917678 is relevant to this question because, at the time of this post, toggling the Menubar does nothing.
Jan 17 14:40 UTC
Firstly (assuming you are using Ubuntu with Unity), an option exists to toggle the Menubar under the View menu. The right-click functionality you mentioned also exists when right-clicking on the breadcrumbs bar or App Menu.
Secondly, Bug #917678 is relevant to this question because, at the time of this post, toggling the Menubar does nothing.