Windows 10 on Latitude E7440 - strange font sizes in some applications

Hi,

on my Dell Laptop, runnig Windows 10 on a Latitude E7440, there is an issue with incorrect font sizes displayed. Especially in Visual Studio designer this is a real problem, but it also happens in other applications, such as TortoiseSVN, Notepad++ . I already tried updating to the latest drivers, especially the graphics-related, but the problem remains...

Any ideas how to get rid of this issue?

Thanks beforehand...