Hence the beauty of Locally Integrated Menu ( in Unity ) + Global Menu : a smart way of using empty space of top panel and title bar, while keeping a classically worded menu in user’s language and giving the whole window to app’.
@Marissa it seems you make use of a top panel, pixel saver applet and ( centered ) global menu applet may provide a workaround to save some vertical space - but these applets won’t have any effect for CSD app’s ( see here how it works ).