Updated to Sequoia on MacbookAir. Trying to find ANY way to reinsert or find my Mailboxes in Apple Mail Sidebar. Any succinct directive to remedy this is HIGHLY appreciated. Patrick :)
Youāve tried selecting View > Show Sidebar (which changes to View > Hide Sidebar when the sidebar is showing)? Perhaps toggle that back and forth.
If what Adam suggested doesnāt fix it, at the top of the sidebar should be something that says āFavoritesā. If you hover the pointer on that line, it should expose two controls - if the right-most control is a caret pointing right, clicking it should open the favorites. If the caret was pointing down already, there should be a ā+ā icon just to the left that lets you add the mailbox(es) of your choice to the list of Favorites.
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Thank you both, as Iād like to hear about a deep dive into this issue not just performing these two acts which are elementary. Donāt mean to sound bombastic but getting frustrated in reestablishing all my Mailboxes. Maybe pacifist can do it from a backup. Weāll see. Thank yāall. Patrick
Are you saying that our suggestions didnāt work? Perhaps if you shared a screenshot, things would be clearer. Just drag it into a post to include it here. (But make sure itās in PNG format, not PDFāsome people still seem to have PDF screenshots, which are awkward.)
Thank you, Adam.
Iām in process.
Found Mail on MacStudio (V10) and compressed it. Moved it to my macbookair. Used pacifist to unzip it and load it to my macbook air Libray /Mail all at once. Waiting for Mail to hopefully āseeā all the files and upload them all. Will let you know. Patrick
I hope that works because once you start mixing versions of Mail and macOS, youāre in uncharted territory.
Well put, Adam. Itās still a mess.
In the old days we could literally take Mail from one mac to another and it seemed to work and populate Mailboxes etc. My issues started w Sequoia AND Xfinity / Comcast mail. Still working on it. :)
Did you try using Migration Assistant?
I havenāt and thatās a great idea. Not much experience with it but it might be the gem I need. Thank you. Patrick 
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I only mentioned it since I used the app recently due to an issue with my M1 Air. Initially, I had decided to partition the SSD into two or three sections thinking I would keep an older system on one if need be due to some older software that was working fine in Sonoma. But at some point, I ended up deleting one partition and then when I was trying to upgrade to Sequoia, I kept getting the āfailure to personalize errorā which is generally a firmware issue. So I ended up taking it to the Apple Store and they restored the M1 using Apple Configurator to the latest at that time which was Sequoia 15.0 and I just decided to keep the SSD as one volume with no extra partitions.
Before I tried Migration Assistant, I copied my mail folder from my CCC backup as I had done in the past but it didnāt import the way Iām used to so thatās when I tried Migration Assistant and that worked fine. My mail setup has five accounts but I use them all as POP so if yours are IMAP, that could make a difference but in the end, it worked for me and hopefully for you as well.
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