Option to select "All Inbox" on Mail disappeared in iMac with macOS Ventura.

In Mail, I have lost the option to select “All Inboxes” from the Mailbox List on my iMac. It disappeared and is no longer a choice.  Is there a way to get “All Inboxes” back?  My 5 emails accounts are separate now. I have to select each account separately in order to read all emails. (My iCloud email inbox and ISP provider inbox are separate.) I have all my emails in each separate inbox so that is not an issue.

I am running Ventura 13.6.4 on my iMac. My iPhone and iPad don’t have this issue.

[Re-Titled by Moderator]