File | Delete Workspaces
Click Delete Workspaces on the File menu to delete one or more existing workspaces.
When you click Delete Workspaces, the Delete Workspaces dialog box appears. In this dialog box, select the workspace that you want to delete and click Delete.
Click Close to close the dialog box.
For more information about the different levels of workspaces and how to use them, see Using Workspaces.