Setting which faculty or staff members are responsible for approving leave for students is done in the GROUPS MANAGED tab of the staff members personal profile.
Reach will match the student's Dorm "and" Grade details to determine which faculty member gets notified and has approving responsibility for each student's leave requests that are generated.
The Groups Managed tab is available only for staff type user roles. You will not see the Groups Managed tab in student, parent or host profiles.
Leave Approvers will only be notified and receive approval requests for students that match their Groups Managed settings however they can, if permitted, still approve leave for other students by using the Proxy approval method.