Did you find out a solution yet? Below is what I have found and it is certainly not a solution, just a band aide.
When I saw the option to change to the new version, I thought I'd try it and, of course, I found out the nightmare that Microsoft has completely shown that is an absolutely lack of caring and disregard for their consumers.
I did take note that it allows us to revert back to the old one, at this time (how kind of them). I am trying to figure out how I want to handle all my old records before Microsoft does its' final transition, which I understand is the last quarter of this year.
It was an easy revert back. Hopefully, reverting back works as easy for others as it did for me. The most difficult task will be figuring out how to deal with my other pst files. As of right now, I moved them all into the current 356 account until I can figure out what to do with them before the last quarter of the year.
Here is the Microsoft link to how to revert back to the old: Toggling out of the new Outlook for Windows preview - Microsoft Support
Good luck to all of us!