I am having similar problems I have a calendar that is connected to another of my email addresses that I don't use and cannot turn it off it opens as my primary calendar. They have released this without proper testing the calendar does not display the date correctly you cant scroll down using your mouse wheel you have to go up and use the down arrow and so the list goes on. Outlook was bloat ware it had been modified and modified to the point where was as slow as a wet week and nearly as useless. Seems whoever is in charge of development is too busy being Woke to select people who know how to code. Hiding everything you want down a level in the menu is crazy stuff. I am off looking for a better mail client this is useless.
Snoopy.