To better control record sharing, use the Grant Access Using Hierarchies setting on queues to choose whether records shared with queue members are also shared with their superiors. Previously, superiors were always added to queues by default and often received too many email notifications.
Where: This change applies to Lightning Experience and Salesforce Classic in Contact Manager, Group, Essentials, Professional, Enterprise, Performance, Unlimited, Developer, and Database.com editions.
How: From Setup, go to Queues. Create a queue or select an existing one. Select or deselect the Grant Access Using Hierarchies setting, and then save your changes.
The Grant Access Using Hierarchies setting is enabled by default in existing queues and disabled by default in new queues. To control the default value of this setting, select or deselect the org-level setting Grant access using hierarchies by default in new queues on the Sharing Settings page. This setting doesn’t affect existing queues, and you can still modify the individual Grant Access Using Hierarchies setting on queues.