If you no longer want to use a saved workspace, you can easily delete it.
To delete a saved workspace:
Choose File > Workspace > Delete, or press Shift + Alt + D to open the Workspace dialog.
Select the workspace file you want to delete.
Click Delete.
Setting General Program Preferences
Resetting Application Preferences
Setting File Format Associations
Setting File Format Preferences
Customizing Toolbars and Menus
Adjusting Monitor Display Options