How to remove people list when you search in mail app?
Take a look at the picture:
As you can see, there's People section under search box, how can i remove "Service Desk" from appearing here?
I don't think you can remove the people list from search results.
If you search, for instance, for "Service Desk", mail will lookup in any header: From, To, Subject, and other; therefore mail will include previous recipients and contacts.
Be specific about the message header to use in the search.
You can perform the search by adding the keyword "Subject":
Subject: Service Desk
Create a smartmailbox like the one in the picture.
In this example the smartmailbox will lookup for all message containing the word "Facebook" excluding this word from sender and recipients.
You will need to double-click the smartmailbox and edit it every time you want to do your custom search.
Window > Previous Recipients.
Remove From List.