yED Graph Editor exhibits the usual symptoms of high DPI non-awareness : over-large icons with very jagged lines.
Windows 7 64-bit, with DPI display set at 150 %, 24" 1920 x 1200 monitor.
The usual remedy which works in 32-bit programs does not work here : it's impossible to tick the Disable display scaling on high DPI settings box, in the Compatibility tab of the executable's Properties. Using a 32-bit version of the program is often a workaround in such case, but there's no 32-bit version for yED.
It says here to upgrade to JRE 10. I just checked, and I only have JRE 8. However, I used the yEd Graph v.3.18.2 installer, which says it comes "with JRE 10". Any ideas ?