New answers tagged overlay-scrollbars
According to this thread: http://lists.kde.org/?l=kde&m=117313789128261 it is a Style-thing under "Application Appearance" in 'System Settings'. Here you can configure the 'Widget style' by using the button after the name of the 'Widget style'. Then you can change the width under the 'Scrollbars'-tab (with the standard Oxygen 'Widget style').
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