Question about Adobe Lightroom 6

Lightroom 6 looks great on my 4K monitor and is also adapted to it (not like the old versions where you almost had to use a magnifying glass for the GUI).
Small addition: A 4K monitor represents approx. 8MP, which means that LR still omits a lot for menu, GUI etc.. So you have to zoom in anyway to see "all details" (all pixels) :)

By that I mean Ultra High Definition (4k screen). For example, I have a Nikon D810 with 36 MPixels. Do I see all the details when I use a 4k screen, or could I just as well use a Full HD screen?

I don't understand the question, can you ask it in German?