Change to Mail in iPadOS 16.1

I’m unhappy about the iPadOS 16.1 Mail mailbox title behavior compared to iPadOS 15.7.

Formerly (ipados 15.7):  title of mailbox is displayed with a back arrow, just above the “Inbox” title

Now (ipados 16.1): no mailbox title is displayed.  Instead I get a sidebar icon.

This is a big problem as I have a mix of POP and IMAP mailboxes and I need to know which I’m in so I don’t delete emails inappropriately.  Clicking on the sidebar icon shows the mailbox but the sidebar goes away again if I click on a message.  Plus, clicking on the sidebar takes away a third of my screen real estate.  Very user unfriendly behavior.

Here’s what I’m seeing on my iPhone (OS 16.0), showing the behavior I used to see on iPad (15.7):

Here’s what I’m seeing on iPad (16.1):

Now I’m afraid to update my iPhone to 16.1 in case the same thing happens there as well. Can anyone who has updated their iPhone to 16.1 confirm that the mailbox name is still there, or has it changed to the sidebar icon?