As I said before, I HAVE 125% DPI settings in Windows 10 Pro. And it is not working !!!
So your argument to change it to 125% is not correct. I have this setting.
If I change to 100% everything is perfectly fine, but all my icons and text is to small on my screen and not readable.
I did a lot of life chats with Apple for this problem. And I called the helpdesk. Finally I had someone from tech support. She looked together with me on my computer.
And the answer was:
"It is not a settings problem in iTunes. It works in 100% DPI so we can't do anything for you."
You have to leave a feedback for the engineers. And if there are a lot of feedbacks about this, maybe they will look to this problem."
So, everyone, please leave a feedback, maybe we are lucky and they will look to this in a while.
https://www.apple.com/support/feedback/