Well, we have Win7 in operation until further notice. The window arrangement is not quite as elegant as with Win10.
If I simply turn the screen into two screens and divide them horizontally, I have solved the problem with the window arrangement very simply. In Win I simply say I have two devices which are arranged one above the other and each have a resolution of 3840*1080. I already have 4 quasi-independent windows for my database applications.

maybe i don't understand the question correctly but you do arouse my curiosity, what is this function needed for? --> i would buy such a screen for the very reason of not needing a second monitor... ;) 40" and 4k are like 4x 20" screens with 1080p... just note that you need a graphics card with hdmi 2.0 output or even better a displayport output,... for office and multimedia it is a great monitor... (unfortunately, not suitable for gaming due to 60FPS limitation and latencies...)