I upgraded to 6.0 today and was really looking forward to the vault feature in the hope that one vault would be shared while the other would not.
My setup consists of 3 windows devices and 2 android devices (each with their own PRO licence).
I managed to generate the new vault but when I come to tell it to sync to the same google drive location I get an error telling me that this is not possible. In my opinion the name of the first vault was system generated while 2nd vaul
Good news !
You can share multiple vaults using the same Cloud (at least OwnCloud/NextCloud).
This is possible through Webdav file access.
The solution is the following : when adding a new Vault in Enpass, using webdav synchronization, define the URL as such:
myowncloudserver is your owncloud/nextcloud server, with any additional sub-path needed
username is your own