Hello.
Win 10 Pro, 64 bit, Unity 5.6.5. I use two monitors as in the image below:

Number 2 (Full HD 1920x1080) is the main screen for windows, I work on it, and the Unity Editor runs on it.
Number 1 (4K 3840x2160) is an auxiliary monitor for viewing graphics, etc.
The problem is this: if the unity editor is running on a smaller monitor (2) the windows from
the editor’s unity transferred to the larger monitor (1) do not open - and can not be magnified - beyond
the resolution of the monitor with lower resolution. So a quarter of the big screen.
For many reasons I can not change the places of monitors, I use them for other works. Of course, when I run the editor on a large monitor is ok, but it does not make sense.
Has anyone had such a problem? And can it be solved?
Kind regards,
Kajetan