How do I un-join a Project site?
If you have manually joined a project site, you can manually un-join the site.
Go to Membership (on your Workspace site).
This displays your site Membership page.
Under My Current Sites, locate and checkmark the Project site you want to un-join.
Click Unjoin.
This displays an unjoin confirmation page.
Click Unjoin.
This removes your account from the Project site.