Is there a way to update the Item Search API fieldset used within an CMS merchandising zone added through SMT?

page: Merchandising Rule Setup->SuiteCommerce Advanced->Merchandising Rules. Look for the MZ. There's a field for the fieldset in the record.

Awesome, that worked great! Thanks @PabloZ The confusion was in trying to configure the merchandising zone fieldset under Setup > SCA > Configuration > Advanced > Search Results.

Awesome