for anybody who is not on a regular basis switching between vaults this is a terrible change. I´m wondering how many people even use multiple vaults AND switch between them often… probably not many people I guess?
For all other people this wastes a lot of space AND agree that the settings are now less easy to reach because the left sidebar is closed more often than not.
TLTR: Layout before was way better 
Why not let people choose what they want? Move around the buttons like most buttons are moveable, or include a short checkboxable question in the settings/appearance which asks “use the old settings button/help/vault layout?”