The search index box shows (FOLIO) "ID". The search results area shows the "ABA Journal" because it does an "Identifier" search and one of "ABA Journal"'s resource identifiers is LCCN=84641839.
2. Now change the search index from FOLIO "ID" to "Title". The search result is empty.
3. Now change the search index back from "Title" to FOLIO "ID". The search result is still empty because there is no FOLIO ID = 84641839.
This issues is about the naming of the FOLIO "ID".
The issue about the default search index is