Good afternoon Gerald,
When I first starting using Cockpit as well I was lost as many of the things I learned how to use in the old Web-admin interface had been put in different spots. You can access the NS hostname/alias settings via System -> Overview -> click on host name/alias. All other DNS entries are available System -> Overview -> DNS.
I’d assume the virtual host is approximately the same but to be honest I don’t use this feature much (all my vhost settings are defined within each of the apps I use like Sogo/Nextcloud).