I have just installed Sentinel LDK 7.5 for Windows and find that some sections of the tools (dialogs, etc) are unusable on my 4K display (3840 x 216) with scaling set to 200%.
I see that Qt 4.8 is being used for the vendor tools, but high DPI support in Qt was first introduced in version 5.6.
With the number of 4K displays in use set to grow, it is time the LDK was updated to support such displays.
Regards.
Brett