My Xmms2 Client Settings

The settings tab is accessible from the settings icon next to the progress bar, here you can select which columns you would like to be displayed on each of the three tables and whether you want the row numbers included on the table. The column widths will be saved along with the status of shown / hidden. You can resize your columns to any width by dragging the right separator on the header bar, also you can double click the separator to automatically resize to closest fit.

Xmms2 Library

Playlist Manager

Now Playing List

Equalizer Settings