if you are using Linux that uses GTK for eclipse, you can modify the file $ {ECLIPSE_PATH} /plugin/org.eclipse.platform_ $ {version} /css/e4_default_gtk.css. If you are on a different OS, you can also find the corresponding css files.
find
.MPartStack { font-size: 11; swt-simple: false; swt-mru-visible: false; }
change the font size to 9 or another size you want. After restarting eclipse, the font size in the title bar will change.
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