Currently to archive/unarchive a project, you have to use the Groupshare web interface.
Would be great to add this to Trados Studio also.
One of the key requirements of the Archiving functionality, was also to remove the data to be loaded by Studio, to increase performance of systems with a large amount of projects.
As such it was a concious design decision for Studio to not "see" these projects. As you might have seen from GroupShare 2017, we are trying to move the Project Manager more and more into working on the website, rather than Studio, as such it's unlikely we would add this functionality into Studio at this stage.
Currently to archive/unarchive a project, you have to use the Groupshare web interface.
Would be great to add this to Trados Studio also.