I have two different mailboxes on my Outlook tree (aside from my own)

Both of these are generic mailboxes to which emails are sent and there are a team of different folks that monitor and respond to these emails.

I am no longer apart of one of those teams so I would just like to remove the mailbox from my Outlook folder mail items tree.

However, I can't seem to find anything in any of the Outlook menus options that permits me to do so.

The Tools/Account Settings option wants to remove MY maibox, not the mailbox I have selected.

What am I missing?