Is there any way to adjust local users in the UI?
ESXi local users can be managed bu connecting to ESX host directly(without vcenter) through vsphere client.
in version 6 you can do this from vCenter as well.
Use ESXi Embedded Host Client – VMware Labs
Here it is Manage > Settings > Local Users :
Hi Ryan,
We are working on user/group/role/permissions management at the moment... should be available in the next release.