Using New Outlook on Windows for personal email, calendar, and contact management
It is there under Privacy Settings, however even if you do this you still are not able to access the Editor Settings.
Update: Rechecked today, November 22nd, I am able to access Editor Settings. Spell Check is working, however, unlike every other MS product I have ever used [including this page]...you have to left mouse click to see the correction! I will most likely keep using Microsoft Mail, until access is permanently disabled. It disappears every once and awhile, then comes back?