Hi Paul you can't from the UI as far as I'm aware.
However you could reactivate it from code using the Project Publisher class-
ProjectPublisher projectPublisher = ServiceLocator.Current.GetInstance<ProjectPublisher>(); projectPublisher.ReactivateAsync(project);
It seems like their is no option to UnPublish a project but it is most asked feature and Episerver will introduce it in future release. Please see the Asa Sundin comment on below article.
I have created a feature request here.
It would be great if other developers could show their support for this feature.
Maybe using the code Janaka has posted.
We were working upon a translation project that requires us to create a project so that this can create a translation package that can be sent to a translation company.
During this process a user changed and published the project by accident.
Is there simple way to unpublish the project or revert all the items to their previous version?