If you need only approvers such as line managers to receive approval emails you will need to disable the Emails WILL be sent to employee option on the employee's post.
To do this:
Search for the employee that received the email and go to their profile.
Click Employment, then Position.
Click Post Details.
Click Approval, then Approvers.
Click Edit in the relevant section.
For example, if the email received was related to leave, click Edit on the Leave line.
Click the Emails WILL be sent to employee toggle so that it's set to Emails will NOT be sent to employee.
Click Save.
