Expand 'Field' dropdown on labeling tab to be taller

[wayfaringrob]

Right now, whether you have 4 fields or 400 fields, the Field dropdown on the label tab only shows you 4 at a time, and you have to scroll to see the rest. Not even resizable. This is a huge PITA when you're trying to quickly identify the right field and switch your labeling - it's literally impossible; another huge drag on efficiency in Pro. You have to sit there and scroll, read, scroll, read -- or go open a pane, click into the expression, delete the expression, and use that field list, which shows you a whopping 8 fields at a time -- 10 if your ribbon is collapsed...how many clicks am I at? Just make it full-height, please. As tall as it can be.