Why are the arrows to the left of folders missing?

Thanks for your suggestions, but I finally figured it out. looked at the View Options for my Documents folder, then at my Current Downloads folder, and saw that the Documents had the Arrange By setting, set to Kind, and Sort by also on Kind. While my other folder had the Arrange By set to None, and Sort by to Kind. So I changed the Arrange By on my Documents folder to None, and Voila! Now the arrows are back, alongside each folder! Another little thing that the Apple Help menu unfortunately doesn't make very clear. Like, what exactly is the difference between Arrange by & Sort by? I can't tell why arranging by nothing means I'd have the arrows, while if they were arranged by kind, there'd be no arrows... doesn't make much sense to me, but then, Apple's products have steadily lost their vaunted "intuitive" reputation, from years past...