Notes
When an approval request email is sent to the assigned approver, the delegated approver also receives an email notification that there is an approval request to review.
Delegated approvers can't reassign approval requests; they can only approve or reject approval requests.
Delegated Approver:
Your alternate approver.
Manager:
Depending on how your admin sets up approval processes, requests for approval can automatically be routed to your manager.
Receive Approval Request Emails:
Controls whether you receive approval request notifications by email, in the Salesforce mobile app, or in Lightning Experience.
If you select Never, you don’t receive approval request notifications. However, you still receive approval request emails from a queue, depending on how your admin configured the queue email.