Mail - folder in the In Box (Mojave)

I'm moving manually to a new 2019 iMac and have set up my mail accounts. No problem.

1. Is there any way to change the order of the accounts list - in the In Box? This would be so I can put the most used ones on top.
2. I noticed just ONE of my accounts has a folder stack (disclosure triangle) which reveals folders for - archive, deleted, drafts, junk, notes etc....) All the other accounts are consolidated into the categories together (normal). So for instance the Mailboxes/Drafts section has all the different email accounts included in it together. Except this one. It happens to be on one of my own domains - but I have other domains that all behave normally.

Just trying to figure out how this one is different - how it happened - and if it can be fixed.