Page layout editor is a tool that allows you to customize the layout and organization of detail and edit pages for a specific object and record type combination. You can also use page layout editor to customize related lists on detail pages by adding or removing fields, changing column order, sorting records, etc. To meet the requirement of showing different fields on the Case related list from the Account record for Sales and Customer Care users, you need to use page layout editor to modify the related list properties for each page layout assigned to those users. Reference: https://help.salesforce.com/s/articleView?id=sf.customize_layoutrelatedlists.htm&type=5