change order of parts

Hi, is it possible to modify the order in which the separate parts appear? Attached a screen dump of the parts window; I would like to move Supers I,II to before Bassus I,II. I've tried dragging the parts in this window, but that doesn't work. I've also tried dragging the tabs in the score window, but that also doesn't work.

Thanks,
Andrea
(MS4.4 on Mac OS 14.6)