You will need to delete the project folder from the directory where it was saved.
We do not recommend deleting old projects, just in case you wish to open/edit/order again at a later date.
Once the project is deleted from your computer it cannot be retrieved. Typically the projects will be in your Documents folder. To find a project on your computer, try searching for the project name using the Find command in Windows or Spotlight on the Mac.
Note: The project will still appear in your Saved Projects panel until you exit and restart the program.