What you could use is the "Object Viewer" by going to View -> Object Viewer. I set up my Object Viewer command on the tool bar, so that I could access it when I need to. When you find the study you want to edit inside the Object Viewer, simply right-click on the study and choose "Properties".
The Object Viewer not only contains the studies that are active, but it will list everything else that is not a study such as arrows, guidelines, volume profiles, etc.. This is probably why the "Object Viewer" nomenclature was chosen. I actually like the Object Viewer, because it saves me from having to hunt all over the chart to find something that I may have drawn days or weeks past. Anyway, good luck with your trading.