I don't believe it's an option for that model. Here's a link I found on YouTube:
https://www.pinterest.com/pin/296604325433803724/ But it's for a machine with a touch screen, and the buttons aren't the same. I know how to do it on the 4 Series up to the 7 Series machines, but have never done it on the Virtuosos.
I think it's a big no-no for a Bernina dealer to give that info out to the general public. You can imagine what a customer could mess up if they got into the service panel and started pushing buttons they didn't understand. It could turn into a big problem!