Make variable list larger in Enrich tool

[wayfaringrob]

I'm not sure if this same interface is used in other tools, but in the Enrich tool at least, it provides a tiny window for viewing all your selected attributes. Only about 3 are visible at a time and it does not resize with the window. It would be infinitely more useful if this area took up the full height of the pane and responded to changes in window size.