The Autosave preference is one of the quick preferences that you can activate on the Tool Bar. It…
Vectorworks Tip #049 – Document Preferences – Auto Classing
When you insert many of the standard Vectorworks objects, they automatically assign themselves to particular classes. If you don’t want this to happen you have to turn off Auto Classing. If you turn on Auto Classing, all of your standard Vectorworks objects will be assigned to their standard classes.