I’m frustrated

How can I put three emails into ONE Inbox etc.?

On my MAcbook Pro, I have been using Thunderbird for quite a few years. I have three email accounts that all went in and out of the same folders, i.e. one inbox, one sent, one trash folder etc. Today Tbird updated and when I restarted it, all three email accounts split into three everything. I now have three inboxes, three sent, etc. How can I combine them back into ONE!!?
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