It’s not ports, it’s controllers.
You identify each controller, and then can allocate them using the
Devices tab in Qube Manager settings for each qube.
Sometimes you may find 2 controllers on the same port -this will be if
the port supports USB2 and USB3.
Once you have allocated the controllers, you can easily identify the
ports they control.
Sometimes too, the USB controller may be associated with other devices -
you may find that the qube does not start until you also allocate these
other devices - common on laptops.