This package contains a sample script in the doc directory named
appmenu-qt5.sh which activates the global menu for Qt5 applications.

To activate it globally for all users, save it in
/etc/profile.d/ and make it executable. This is not recommended, because
it works currently only with plasma-widget-menubar in KDE SC4, all other
desktops are not affected. It would cause that the menubar of
Qt5 applications is not visible there.

To activate it for a certain user, integrate it in the appropriate autostart
toolchain of your desktop environment or session/window manager.