On my Mac, yEd's multi-tab dialogs show the active tab name in white text on a white background, with only a sliver of a shadow to help me see it. It's a distraction and a nuisance.
Here is an example dialog with the "General" tab active:
I asked a similar question previously.
In a dialogue box why are headers hard to read? - yEd Q&A (yworks.com)
The answers to that question describe a temporary workaround.