Disable Capitalisation

Hi I would like to disable automatic capilisation for the surnames of authors. This is how the starbox looks like right now: https://gyazo.com/53a13e3451ffc1ec5c04904ec3a41b8f But I would like that the v from ”van” isn’t capitalized. Changing this in the name section doesn’t work since it automaticly capitalizes the first letter of the surname: https://gyazo.com/9ae08cebbab7812333b88ff5b86d5342

Can I disable auto capitalisation in any way?

The page I need help with: [log in to see the link]