Removing a "Available Classes" bar on the right of pages?

Hi, Not sure where it came from but there is a new bar on the right hand side of some of the pages labelled "available classes" can this be completely removed from all pages with some CSS or other setting?
http://monosnap.com/image/7cMtirbFYZoFnXVUYKZ5c6A3kQChEN
domain: http://tinyurl.com/q8zogne

Support Access is open

Thanks
Tom