Display pull-down menus from the classic menu bar using one of several methods. You can also specify alternate menus.
The classic menu bar can be displayed at the top of the drawing area. The classic menu bar is displayed by default in the AutoCAD Classic workspace.

You can specify menus to display in the menu browser for all workspaces by customizing a CUIx file and loading it into the program.
Pull-down and Shortcut Menus in the Customization Guide