Preview windows 10 Yoga 3 Pro

Dear everyone,

I just installed WebsiteX5 Pro on my new Lenovo Yoga 3 Pro with Windows 10.

I made a new projekt with a responsive design enabled.
After I enabled the responsive function, i cant see at the preview the "normal" design anymore. I chose the two design options and made them look really different so see which one is shown.

My Lenovo Yoga 3 Pro has a 4k 3200 x 1800 pixel screen and my monitor is connetd to it with dvi cable and 1920 pixel.
Does anybody know a settings change, to solve my Problem?

Thanks a lot in advance,

David