If you hide a particular Item type, Collection code or Shelving Location value using OpacHiddenItems system preference it will usefully also hide that option from the Advanced Search items search filters (the tabbed display controlled by OpacAdvancedSearchTypes). However, if you make use of OpacHiddenItemsExceptions the values hidden by OpacHiddenItems remain hidden in those Advanced Search tabs for logged in patrons with a patron category that have an exception. It would be great if those patrons could see the hidden values in the tickbox filters to help with searching.