Lubuntu -- Menu bar still showing in LibreOffice fullscreen view

I like using fullscreen view, however in some distros including Lubuntu which I am now using, the menu bar doesn't go away. I even tried using version 7 (the AppImage) and the same thing happens. It seems to be a Lxqt or OpenBox setting that needs adjusting. Please help.
[Running Lubuntu 20.04 and LibreOffice 6.4]
Thanks, Shloz