When going to Dashboards, the "Create" button is missing when logging as an AD user account with an Administrator role assigned, or the local user admin.
VMware Aria Operations 8.x
The VMware Aria Operations is Standard Edition, which does not include the package of customizable dashboards, reports, and views.
To have this function, need to go with Advanced or Enterprise Edition.
See VMware Aria Operations Packaging for more details.