IMAP "Get Account Info" on mailbox no longer shows subscription list

It used to be that in order to edit which of many shared mailboxes would show up in Apple Mail on the Mac, one would simply select any mailbox, and go to "Get Account Info" at the very bottom, a pop-up window would appear, and one of the tabs within that would be the subscription list. From there, one could see all available mailboxes, and check and uncheck them.

The subscription list is gone from the "Account Info" pop-up window, so how does one edit one's subscription list now? The only other question I found on these forums on this topic had many people piping up to say they had the same problem... but zero functional answers, and no activity since 2021.

Mail app and subscription list in IMAP ac… - Apple Community

Is this just something Apple Mail is no longer able to do, and I'm stuck with my subscription list as it stands from years ago?