When Drupal does a search, and returns no results, an advanced search form is displayed. The form contains a list of content types. There are a couple of content types on our site, but these should be hidden from the user, e.g the end user shouldn't see "contentType", "newType".
I don't want to limit the results, just restrict the user's ability to filter the results using the types.
I've tried looking at the search templates, but couldn't find a reference to the fields.
Any ideas on where I find the correct type or turn off this field?