I want to change the height of title-bar, but until now (as I know) there's only one way to do that : change the font-size of WINDOWS TITLE FONT (in Appearance preferences). So far so good except the BIG SIZE of the text. How could I disable(or hide) the text?
You'll have to edit the theme, if you installed them through the Gnome Appearance window the themes are here:
Look for something like this:
It depends on the theme. Experiment and you'll get results.