Is it possible to add to the favorites:
all sent, all deleted, all drafts, all spam, etc.?
Just right-click on Favorites and choose Display. Then tick the options you want to see.
So the ones you want are indicated here:
Outbox, Unreplied and Snoozed will display automatically if they have content without you ticking them.
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I didn’t expect a right-click, I searched in view and settings.