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-fontsize argument doesn't affect window titles, as Explorer, Output Window, Debugger Window, ...
I don't think, it's possible to change fontsize of titles by this option.
Windows title height (and font size) is fixed. If you think it should be otherwise contact UI/HIE.
Sorry I was wrong. It is possible to modify caption height by UIDefaults parameter "nb.desktopFrameCaptionHeight". If it is not set default value is 20 pixels.
Marek is right - verifying, closing.