Ever had a grayed out typedef constant on your diagram, even though you just selected "Apply Change" in the Typedef window? Checking out the context menu, you may see the "Review and Update from Type Def..." item shown below:
Selecting it opens the identically named window:
Lucky you if you don't have a clustosaurus to check out, as there is not way to scroll past the bottom of the area shown.
Now I am the one who recommended (tongue in cheek) to limit the size of VI panels so I should know better than having large clusters as typedef, but if you do, then there isn't much you can do, save buying a 4K display (or larger?).
A couple of scrollbar would go a long way...
And in fact, this is another illustration of why this should be seriously looked at.
Moved to CAR database: CAR 622301