iClone 6.5 to 7.1 all was fine and perfect, with the "icon and font size" set to MAX the menu items were perfectly coherent with the 4K environment.
iClone 7.2-7.22 the program was running at 1080p, scaled and blurred to 4K (terrible!). It felt like running an emulated software from an old Win98. I had to roll back to 7.1 to keep working.
iClone 7.3 the program doesn't blur anymore, but still looks like running at 1080p. The icons are still HUGE and all the items take too much room on the workspace. Changing the "icon and font size" doesn't have much impact.
iClone 7.3 with DPI override with "icon and font size" set to MIN the behaviour looks a lot like the old 6.5, but the problem is that DPI scaling adds a blur to icons and fonts, which is not that disturbing but is not near the sharp definition it had in 6.5