As John explained, you can move tracks from one folder to another by dragging. My complaint is: why isn't there an option to make new tracks appear under the currently-selected folder rather than always being appended to the bottom? And if they must go to the bottom, why doesn't the track view automatically scroll down to make them visible? And while we're complaining, why is there still no folder-freeze button?
I don't normally **** about missing functionality that isn't a showstopper, but these types of things are a) easy to implement and b)
would have been implemented in the old days.