Thanks cike.
I tried your suggestion, however Firefox & IE still show the tkb option. I also tried setting the visibility property to hidden, but that didn't work either. After some more digging online, it would seem that I'm not the only one experiencing this.
Well, I also saw some other posts on this topic. It seems that IE doesn't support display settings on <option>-tags.
As an alternative, you can add small JavaScript/jQuery snippet which hides/removes the TKB option from the DOM:
$('#lia-body .lia-content select.lia-search-form-granularity.search-granularity option[value="tkb|tkb"]').hide();You may take a look at the remove and/or detach methods of jQuery.
