The Audio Visualization tab presents several options relating to showing visualizations when Xfmedia is playing audio files:
The dropdown box at the top can be used to select the visualization that Xfmedia will display when audio visualizations are enabled. Enabling the audio visualization can be accomplished via the main window's right-click menu.
Some audio visualizations have options that can be used to tweak their behavior, but Xfmedia does not yet support setting those options.