This only works if you have less than three accounts under the new version of Outlook. Now, after the forced upgrading to v. 1.2025.416.400 (Production) there is no fix for this yet. Since I have seven email accounts total that I manage, the new version won't allow for the preferred email accounts in the Accounts pane to be sorted in the way that I wish for them to be sorted. This is why I eventually downgraded back to the old version Outlook as well.
In case you're wondering if Microsoft is forcing an upgrade here is an article that proves that they are:
https://undercodenews.com/microsofts-new-outlook-app-a-forced-upgrade-with-major-flaws/
Unfortunately, until anti-trust laws are expanded to better manage Microsoft as a monopoly they, according to basic Economics, are going to act like a monopoly.
!!!!!SHAMELESS POLITICAL PLUG!!!!!: If voters would do as our forefathers intended for us to do and educate themselves on the issues and vote the candidates character and instead of on what "seems good" from an uneducated perspective or on how "cool or "awesome" a candidate seems things like this would be a lot less likely to happen.