Using New Outlook on Windows for personal email, calendar, and contact management
Regarding the age of this post we can stop waiting for this feature as the Microsoft Team seems not to work with Outlook or the new Outlook in a serious way. If they would the favorites would be fixed on top already for a long time. This makes it completely nonsense to use the New Outlook.
When I read it is "not feasable" I suggest to learn about CSS and fixed containers.
Additionaly I am no friend of web apps on the desktop at all.