Search

Hello,

Adjust Search Scope Besides offering search suggestions, Mail makes another change to its interface as you begin typing a search term. The Favorites bar, just beneath the toolbar, changes subtly to provide controls for restricting or expanding the range of the search (for example, just one mailbox or all mailboxes).

The options you can select are as follows:

• All: Click this item, and Mail searches messages in all mailboxes (including Sent and Drafts) for the text you entered.
• Mailbox Name: If you had a single mailbox selected when you started searching, that mailbox’s name appears in the Favorites bar. Click it to restrict the search to that mailbox. You can also select any mailbox or smart mailbox already on the Favorites bar.
• Selected Mailboxes: If you had more than one mailbox selected, click this to search all (and only) those mailboxes.
• Save: Click this button, which sits at the far right of the Favorites bar, to Create a Smart Mailbox (discussed below).

https://www.macworld.com/article/2142029/how-to-search-smarter-in-mail.html

Good news, great to hear, take care my friend. :)