“Quick Filter” functionality (as it exists in TB desktop) is a glaring omission from this app. I’d like to see unread messages first, but in the order they arrived (newest at top). Selecting unread from the top pull-down results in unread email dates ordered backwards (oldest at top), which is extremely clumsy for a number of reasons.
Complicating this further, email marked as read still displays in the inbox list, when it should remain there but no longer be displayed (again, as is the case with TB desktop). That would at least be some sort of workaround for the lack of a quick filter.