I'm new to Gephi, so I sincerely apologise if my question seems a bit amateurish. Several days ago, after installing Gephi I imported a network file using Netvizz in order to experiment with the platform. At that time my Preview window had full functionality; however, yesterday my Preview window suddenly lost some of its functionality - specifically everything for setting parameters. I've since uninstalled and reinstalled Gephi, and tried working with a smaller network but to no avail. Any ideas on what might be wrong?