[Koha] indexing problem

Dear List, Our library is using Koha version 25.05.06.000 with ZEBRA. We are using field 653 ## - “INDEX TERM—UNCONTROLLED” as an additional subject field. Unfortunately, after searching the database, the content of this field isn’t displayed on the left pane for “Topics”. In the MARC framework, I have activated 653 as a topical term. Any suggestions on how to solve this problem? Thanks, Erlanda