Is it possible to modify electrode arrangements in a top plot to have Frontal electrodes anteriorly, Central electrodes in the middle and Parietal electrodes posteriorly?
Not at the moment.
You'd need to edit all the structures manually (channel files, data files, connectivity files...), with very high risks of manipulation errors.
FYI: we're in the process of updating the connectivity graphs. The default behavior will change in the next few weeks.