When creating a vDS using the New Distributed Switch wizard, a dvPortGroup is created by default. However, there are several use cases for more than one dvPortGroup; for instance, a separate dvPortGroup for VMs needing a VLAN. Like vSphere 6.7, vDS can have about 10000 static/elastic dvPortGroups and about 1016 ephemeral port groups.
Refer to VMware Configuration Maximums at https://configmax.vmware.com to understand configuration limits.