When a user or employee creates a leave request and clicks the "Confirm" button ( action_confirm) , an automatic notification email will be gone to the user's email. How to stop this?  I have user management implemented in hr_holidays so have different states and user approvals for a leave request. I have also implemented notification email templates for all the approvals. So now when an employee confirms a leave request two emails are gone to the user mail.

1. Default odoo email notification.

2. My custom created email notification .

Where is the code for this notification mail is called?

Notification email image down below:

Please Help!!!