The classic workspace no longer ships with AutoCAD.
You can easily recreate the AutoCAD Classic workspace.
  1. To display the menu, click Quick Access Toolbar drop-down > Show Menu Bar.
  2. To hide the ribbon, click Tools menu > Palettes > Ribbon.
  3. To display the toolbars you require:
    1. Click Tools menu > Toolbars and select the required toolbar.
    2. Repeat until all required toolbars are visible.
  4. To save the workspace:
    1. Click Tools menu > Workspaces > Save Current As.
    2. In the Save Workspace dialog box, in the Name box, type AutoCAD Classic.
    3. Click Save.

how to load classic workspace in autocad
how to load classic workspace in autocad