How to delete project in Workbench ?
Just go to your project details and click on the "Delete entire project " button as shown in image below..!!
Answered with a tutorial: https://grabcad.com/tutorials/how-to-delete-project-in-workbench
Please don't try to delete MASS Collaboration project in Work-bench.
If you wanna out from collaboration or any sharing through work-bench than please tell the Author to remove you.
He will remove you securely without any trouble.
If you delete the collaboration project means, its too bad for all project's owner to do again so hard work to make it..!!
Answered with a tutorial: https://grabcad.com/tutorials/how-to-delete-project-in-workbench--1