May be this question does not belong to here, but I do not know where to post it.
I am using Windows 10 Pro 64bit and MMA 11.0.1.
My monitor (32inch) has a native resolution of 3820 * 2160 pixels.
When I use an overall screen magnification of 100% the notebook font and the menu items are much too small.
When I increase the screen magnification to 150% or even more the font (independent which one) is extremely blurry.
!!! ALL OTHER WINDOWS AND FONTS IN OTHER APPS ARE SHARP.
Do you have a solution for that, when monitors have 4K?
UPDATE: Answer from a Wolfram Technology Engineer
Mathematica's front-end does not support 4K resolution monitors fully and is known to have some issues when used in 4K resolution monitors. Our developers are currently working on this issue.