Windows is amateur hour when it comes to 4K support. They have rewritten some applications recently and they are hilariously broken. Like the task manager or the freaking start menu. If the scaling changes once they’re running, they end up a blurry mess.
Also, the task manager never recovers after changing from dark to light mode or vice-versa. The start menu is broken the first time it opens, but it then recovers.
The taskbar sometimes shows the icons at the wrong scale, so you have these weird mis-aligned portions of icons.
At this point I’m wondering if anyone in Redmond actually uses this OS.