Contacts, using of multiple adressbooks not possible?

I am using Owncloud 8.1.9 with Contacts and I know, it’s an old version. I decided to migrate to nextcloud 10.0.1.
The new Contacts Version is, I used two adressbooks “Private” and “Whatsapp” to separate my contacts. In the new Contacts Version all contacts were imported into the same adressbook. I can create two adressbooks, but it’s not possible to select an adressbook for import. How can I seperate my Adressbooks ?

I have the same problem. It seems there is no way to create multiple address books and make them available, one by one, from the web interface.
Does anybody have any info on that?