The problem looks like this:

Recently I have been trying many MCUs, and using various IDEs and programming/debugging tools. Being used to VS and JetBrains, I felt like going back ten years 😂. The first problem was that on a high DPI monitor in Windows 10, the display was blurry. After some research I found a temporary solution:

Modify the exe compatibility properties, go to Change high DPI settings -> Override high DPI scaling behavior, set it to Application, save and restart. The display becomes clear.

Of course, some UI proportions look strange, for example the toolbar, since the IDE is not natively adapted to high DPI. As long as the code part is not blurry it is acceptable. The same issue occurs with Keil uVision, and the same method solves it.
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