Bring back sorting for All/Unread/Mentions and Arrange By quick sorting by Date, Size, etc.
In the latest update the view change to consolidate to a singular "All" dropdown that allows you to choose between the former All, Unread, Mentions and then to easily Sort with Arrange By. For many users the expanded view is preferred and more easily accessible. If that could be made a view option, or a toggle feature I think that would be a functionality improvement
Note from the Outlook Team: We have posted a Known Issue about this change with some explanation and possible solutions, https://support.office.com/en-us/article/All-Mail-and-Unread-Mail-tab-options-no-longer-show-in-Outlook-ecdfda13-bdc1-42e2-a77b-c18f6f291fe1?ui=en-US&rs=en-US&ad=US.
Update from the Outlook team: We’ve brought back the All and Unread filters for the inbox folder, as well as made enhancements to the sorts and filters menu. As a note, Focused and Other pivots will take priority over All and Unread when opted in to Focused Inbox.
These changes should be available for all users with Version 1802 (Build 9001.2138) and above.
The Outlook Team
Jason Fricke commented
I have the latest update (version 1704), and my outlook shows "ALL UNREAD MENTIONS" and not in a drop down menu. My boss has the same version, and his has the drop down "All". So I don't know if this is an update or not :/