How do I set a sub folder as archive?

[ryyagi]

I use Aqua mail pro with imap accounts.

I set the sub folder(e.g. archives/2021) as archive folder, but “move to archive button” is not displayed in message view.
when I set the folder under the root(e.g archive) as archive folder, “move to archive button” is displayed.

Can I set the sub folder as archive folder?

Best Regards