When you access the /configure page in xfpanel, the "Number of columns" and "Refresh time in seconds" always show an error message. This is because the Jelly for the configuration page isn't properly set up to send the data back. In addition, the number of columns is either one or two, so the UX design for this could be improved. The attached patch fixes both problems and swaps the columns setting to a pull-down instead. The second attachment is a screenshot of the updated configuration page.