Modifying Admin Bar menus

I am puzzled by the choice of options for the admin bar menu. (The top menu bar that appears when an admin is logged in.) It seems to consist of choices that would only be useful in the earliest days of site setup and configuration, and requires the user to click “Dashboard” to bring up the full side menu to access posts, pages, users etc. – the things that would need to be accessed frequently during a WP site’s life. Maybe I’m missing something, but having quick, top-level links to those latter admin pages would be far more useful than for Header, Background, Menus etc.

Is this menu configurable, and if so, where?