By default, leave requests are sent to the department manager, but this can be overridden on an individual employee basis by setting their approver.
So if, for example you have someone in a department that needs leave approving by a person other than the departmental manager, this can be set in that user's profile specifically.
Head to the USERS page and click on the employee's name, then into the 'Approver' field to adjust the setting:
This works particularly well for department managers themselves, they may have the authority to approve their team member's leave, but their own might have to be approved by a more senior manager or business Director.
The email notifications of a request for time off only go to the departmental manager or nominated approver.
Special privileges for admin users:
Although admin users will not receive the email notifications or leave requests (unless they are a department manager/approver too), they will have the ability to approve leave for any employee. This helps for cover in the event a manager is on leave and also so they can monitor outstanding leave requests.
To view all outstanding leave requests, click the inbox icon from the top right corner then 'View all' link:
Leave requests are sectioned by approver.