Since Windows 10 latest update a few days ago, the font sizes in yED are broken on monitors with dynamic DPI scaling enabled. This worked before with yEd.
yEd had problem before, e.g. if docking stations had been switched in Windows standby mode, where monitors had different resolutions and scaling, but this could be fixed by restarting yEd.
Since the latest Windows update, font sizes (and icon spacings) are always broken.
Image 1: oversized and bold font in start screen
Image 2: oversized fonts in the property window along with pixeled checkboxes
Image 3: compare windows title bar with menü text, speed buttons (spacing) and docked window titles
I have tested on other monitors with different scaling. In some situations, texts in the property windows are overlapping.