The difference you perceive is in the GUI style (oxygen vs. fusion) - the fusion style paints the title outside the groupbox where oxygen paints it inside (notice that this holds eg. on OSX Aqua as well)
KEditListBox was mostly a QGroupBox and the title attribute was nothing but that of QGroupBox. Try using the Oxyen or Breeze style w/ Qt5 - in doubt set margins and spacing of your layout(s) to 0 when wrapping KEditListWidget as only child into a QGroupBox Cheers, Thomas
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