Previously, to scale the Ignition designer, client and the native client launcher, you would have to edit the resource with ResTuner. However, in more recent versions of Windows 10, it is far simpler.
All you have to do now is right click on java.exe, javaws.exe and the native client launcher, and click properties. Then, click the compatibility tab. In that tab, you will see a settings called “Override high DPI scaling behavior. Scaling performed by.” This typically defaults to Application. If you change this to System, everything should be scaled by Windows, and should be usable. There is also an option for System (Enhanced). I have had UI artifacts while using this mode, so I found that System works best.
Any questions, please let me know.