Archive button not visible in mail window

Hello.
I cannot see the “Archive” button on the mail window. I have tried adding it, removing it, and changing it’s position in the customize menu, but it never appears. It doesn’t matter what kind of account (IMAP, Exchange, or Google). It’s just not there. However, on the main window (showing the list of emails) the Archive button is visible and working. Even in the Android app has a working Archive function in the pull-down for individual emails.

Has this slipped through the cracks? (I have seen old posts mentioning the Archive button disappearing as far back as 2017).

I am currently using version Em Client 10.0.3530 (f0b89b7), but this issue goes back many major version numbers. Workstation is running Windows 10 Pro 22H2