There doesn't seem to be a way to return from Requests back to main Inbox, and from Filtered messages back to Requests or main Inbox. Inbox to Requests works, then Requests to Filtered, all going only one way. The only fix I am able to do is to exit out the entire application and restart it, putting me back in the main Inbox.
View -> Show Active Contacts doesn't work (but View -> Show Message Requests does, as does View -> Show Archived Threads, the latter from main Inbox only).
(using MacBook Pro 11,1 with OS 10.14.3 Mojave on Dark mode)
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