I’m on Manjaro Linux and have the libreoffice package installed from the distro repos. With Plasma 6 libreoffice doesn’t display anything with the global menu enabled. works for other programs just fine, but not LO. LO also does not display a menu bar within it’s own window, so it’s basically useless. It also uses the gtk file picker and dialogs.
These two things are perhaps related, is there an env variable that I need to check? something else?