You are probably looking for glass.gtk.uiScale

I think I reported a while ago that the automatic scale detection for KDE is not working, but apparently there wasn't an easy API replacement available.

On 21/11/2025 18:15, Chad Preisler wrote:
Hello,

When I run my JavaFX (using JFX25) application on KDE Plasma using Wayland the fonts are incredibly small. How can I scale the applicationĀ so that things are not so tiny?

FYI: I had a similar issue with Netbeans. I know it's different because it is Swing. I was able to get Netbeans to look good with the following settings.

-J-Dsun.java2d.uiScale=2 -J-Dflatlaf.uiScale=0.75

Is there something similar I can do for JavaFX?

Thanks,
Chad


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