Flatpak just pushed #thunderbird 115 and I was called in to do tech support. (Reassure that the sudden access to landing pages that "Compact View" used to hide didn't mean account access had broken and undo the changes that didn't get automatically settings-preserved based on using an existing user profile.)

I did what I could but does anyone know why the account names are no longer alphabetized and how to put the menu bar back above the toolbar when "Hide System titlebar" is unchecked?