Collapse filter expanders (v 7.1 build 20946x64)

Hello,
clearly, the filter panel is one of the greatest things since the invention of sliced bread. Kudos to the XlineSoft team! This is a real blockbuster. One question, however, came into my mind soon after using this feature: how could one achieve to have the filter expander elements all closed on page load? This looks nicer if there are a lot of categories to filter.
Any hints and, again, thanks for the newest feature updates which make life a lot easier
Regards