How do I move messages between “Primary” and “Other” inboxes?

Desktop:

1. From the Primary (or Other) inbox view, select the messages you wish to move
2. Drag the message(s) to your desired location, whether it be Primary, Other, or another split inbox you've created
3. Confirm, and future messages from this sender will show up in this inbox.

Mobile:

This functionality is coming to our mobile apps soon, and we appreciate your patience in the meantime!