Left click on a playlist
Switches to that playlist.
Right click on a playlist
Brings up the context menu containing actions for that playlist, and all of the tracks in that playlist.
Middle or double clicking or left button dragging
Performs various tasks depending on your settings. See configuration section for more details.
Dropping files on a playlist with left button
Switches to that playlist, and adds the tracks to that playlist.
Dropping files on an empty area with left button
Sends files to a new playlist.
Dropping files with right button
Shows context menu allowing you to send the items to the playlist under the mouse, or to a new playlist.
The colours of this panel can also be adjusted in preferences, as many other settings covered in the preferences section of this document.