Changing the height of the tabbar in a qtabwidget
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you can use style sheet to achieven this.
Have a look at the "doc of the style sheets":http://doc.qt.nokia.com/4.7/stylesheet.html -
You can also try using "QApplication::setGlobalStrut()":http://doc.qt.nokia.com/latest/qapplication.html#globalStrut-prop. This sets the minimum size a widget can be, and is helpful when making an application more touch screen friendly.