a better (less drastic) workaround is to unset the environment variable QT_QPA_PLATFORMTHEME, this variable is set to: QT_QPA_PLATFORMTHEME=appmenu-qt5
the following will bring back the missing menu bar export QT_QPA_PLATFORMTHEME=
a better (less drastic) workaround is to unset the environment variable QT_QPA_ PLATFORMTHEME, this variable is set to: QPA_PLATFORMTHE ME=appmenu- qt5
QT_
the following will bring back the missing menu bar PLATFORMTHEME=
export QT_QPA_