The value of “0” means that the menu bar is turned off, but a value of “1” means it is turned on. After hitting Enter, you will see an option to enter a value. The alternative option to show the Menu Bar is to type “MENUBAR” into the command line. Once you click this, you will see the menu bar appear above the Ribbon.
In newer versions, one can click the “Customize Quick Access Toolbar” drop-down button, then click “Show Menu Bar” to turn on the standard menu bar that used to be at the top of the window before the Ribbon was added. I am going to tell you a very quick and easy way to get them back. In fact, that is one of the first things I adjust in my AutoCAD User Interface when I load a new product. I think this post might be showing my age, but I still like using the Toolbars in AutoCAD.