Prevent connection to Public Folders on Exchange?

I would like to avoid trying to connect to public folders in my Outlook 365 (Version 1809, Build 1082.80181 Click-to-run). I saw a way to do this in older setups, which involved creating a 0-valued HasPublicFolders key in the registry under "HKEY_CURRENT_USER\Software\Microsoft\Exchange\Setup". But it seems that this registry key is no longer around.

The autodiscover.xml that my outlook gets from the exchange server is trying to connect me to a public folder to which I don't have access...

Prevent connection to Public Folders on Exchange?