Next step reached.
1)
Windows Screen Setting at 100%, HiDPI on, works for Arturia, but then Cubase menues are extremely tiny, partially as one can see on the attched picture.
Any other windows setting does not work. I am used to have it set at 125-150% so I can read the menues.
HiDPI off, Windows Setting at whatever(tested 100-225%), Arturia Plugins work but waste a lot of space. Cubase gets a little blurry then.
So OK, one can use V-Collection, but not together with HiDPI other than 100% and with unreadable menues.
I believe that the problem, if there is one, should be solved either at Arturia for full functionality of the collection or Cubase for full compatibility of VST´s on the market. Especially the HiDPI setting would have saved me from wearing glasses all the time or turn up contrast and brightness on my monitors.