While the feature to sort messages is convenient, it's not a perfect system, and one has to train it
to improve its accuracy.
For example, if new emails arrive and they're sorted incorrectly,
in the Focused tab you can right-click the message and select one of the two options:
1. Move to Other — Relocates the email to the Other tab,
however future emails from the same sender may continue to arrive in the Focused tab.
2. Always Move to Other — Moves all future messages to the Other tab.
Moved to Focused - To move one email from the Other tab to the Moved to Focused tab.
Always Move to Focused: To have all future emails from the same address available in the Focused tab.
Web Version of Outlook:
1. Right-click the email and select Move.
2. From in the pop-out sub-menu, select from the options to Move to Other Inbox
or Always Move to Other Inbox.