Old lasting bug ... [image: Popup-1.png] [image: Popup2.png] Funny things happen in full screen ... In this screenshots you can see an another bug : the checkmark ✓ doesn't follow the font size of the menu. [image: Popup3.png]

@mrjj Thanks for the reply! I followed your advice and tried setting the panelWindow as the parent... No change.. Any other ideas? I followed this link, http://doc.qt.io/qt-5/qmacnativewidget.html#details