From Performance Center, Test Desing section(Dashboard), the UI field that opens for "Select virtual location" link doesn't have a way to scroll down and select another Virtual Location, therefore only the first three locations can be selected by default. In other words if we have four or more Virtual Locations we'll be able to select one of the first three locations because of UI issue. Also, we noticed that the Cancel button for this window is not working.
This issue has been fixed on the patch 1 for Performance Center 12.20.
You can download the patch from here.
Hewlett Packard Entrerprise Support