Hello,
I am new here and also to krita (I am working on a macbook air with a UG 2150).
I am actually experiencing an issue with the multiple view : once I created a new view on my document I can't bring it on an an other monitor (both from the mac to the ugee or the opposite). It just extends the space of the main window and don't want to be detached.
I don't think it's a driver issue since I don't have this issue with photoshop.
I should mentioned that I am able to take floating windows on the other monitor.

Any idea ?

You need to first create a new window: window/new window, then move that to your other monitor, then in that window create a new view. I know that this works on macOS, because I did just that last Saturday.