That can only be achieved by buying the extentions. It's misleading and digitec/galaxus should add that in the description. I've measured the gate (white part) which comes to ~68.3 cm and then with those 4 clamp-thingies you can fit it to a ~80 cm door frame. For anything wider you need the extensions.
Hope that helps. Oh, and I did find an image showing extentions and their ranges on amazon.de

https://www.amazon.de/Safety-1st...