Design Flaw - Background of Categories in Refine (Search) Results
The background color of the categories need to be distinguishable, just like "Order By" - otherwise the user will think there are only the limited number of categories that first pop out in the list? Pls see screenshot.
Also the indentation of the categories from the subcategories need to be pronounced. It would be best if the main categories are in bold letters to make it standout? Or show the scroll to indicate more whether or not the user hovers over the categories.. The scroll handle does show when you hover over the categories.