QT program under Ubuntu full screen, pop-up dialog box, how to hide the top status bar

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Ubuntu, use showFullScreen () full screen, then pop up the dialog box Qdialog or the status bar at the top of QMessageBox, will be redisplayed. Is there any way to keep the status bar hidden in the pop-up dialog box or QMessageBox

Ubuntu16.04 qt-creator qt5

Dec.23,2021

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