Setting Up Leave Approver
The leave approver is able to approve or reject leave applications from employees. In Workbeat, we have set by default to the reporting manager of the employee.
Path : Leave > Leave Settings
There are two options of approval, 1 level approval is more direct where only the assigned approver can approve employees' leave application.
Meanwhile, 2 levels of approval is required to assign two different approvers with an option where all approvers must approve or either one can approve the leave application.

2 Level Approval

1 Level Approval
When All approvers must approve is selected, the approval will follow the approver sequence.
The first approver must approve the leave request first. Only after the first approver has approved it, the second approver will be notified to review and approve the request.
This means the second approver will not receive the approval notification until the first approver has completed the approval.