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

Under

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

?
Dec.23,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3339c-2be83.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3339c-2be83.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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