You can't, but you can Drag & Drop the Playlists anywhere else in the Playlist node . I'm assuming you mean where it says playlists over on the far left. I went into the imported playlists folder did a ctrl A and dragged all of it over to the playlists icon on the far left. This seems to have done ...

A while ago I imported about 15 years worth of playlists out of windows media player to media monkey. However it has imported them into a folder called "Imported Playlists" and my first backup generated a bunch of m3u playlists that have Imported playlists amended to the beginning of the file names ...