Explanation
Permissions and tab visibility are two options that administrators can adjust to fully restrict access to records for certain users or profiles. Permissions determine what users can do with records, such as create, read, edit, delete, view all, or modify all. Tab visibility determines whether users can see a specific object tab in their app launcher or navigation bar. By setting permissions and tab visibility to none or hidden for deal records for service users or profiles, administrators can prevent them from accessing deal records via search or other methods. References: https://help.salesforce.com/s/articleView?id=sf.users_profiles_permissions.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.customize_tabs.htm&type=5