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Turn off the clean Screen feature. The Clean Screen feature maximizes the drawing area by hiding the ribbon, toolbars, and palettes. Press CTRL+0 (zero) to toggle the Clean Screen setting. If the command line says "CleanScreenOn" at this point, press CTRL+0 again to turn it off.
Turn on the ribbon setting. At the command line, enter the RIBBON command to restore the ribbon.
Change workspaces. Switch to a different workspace or switch to another workspace and then back to the current one.
Manually turn on toolbars. At the command line, use the -TOOLBAR command or click the Tools menu and go to Toolbars. You may need to change the MENUBAR variable to 1 to see the menu bar.