How to restrict the value lists of advanced searches?

Summary:

How can I restrict the list of available variables for the Business Unit field in the advanced search functionality?

Content (required):

I am currently implementing Fusion Service for a company that has representation in multiple countries, and access is controlled through security policies. Now, when customizing an advanced search, the user notices that the list of available values for the Business Unit field displays records that they do not have permissions for.

Version:

Oracle Fusion Cloud Applications / 23A (11.13.23.01.0)

Thank you in advance for your help