Using Classic Outlook on Windows for personal email, calendar, and contact management
But the issue is at the root level of each email address account, it used to show the number of unread in the inbox next to the email address accounts, without expanding the account to see all the folders.
You can set folders to show total instead of unread as well. If you look at OP's question it seems to be more about folders than individual accounts. There is more than one issue at play in this thread. All are valid and need to be corrected, but the initial question is about folders.