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Global menu in GTK applications does not work

Hi guys. I'm having a rather curious problem with KDE Neon that does not happen to me in ArchLinux, for example. Applications like Firefox, Thunderbird or LibreOffice show me the global menu, however, others like GIMP or Inkscape do not. But, if I run GIMP or Inkscape in the terminal, if they show the global menu ..

If I put the file .profile, .bash or .zshrc the command: export GTK_MODULES = "appmenu-gtk-module" the variable is exported without problems, but for more than restart, the same thing keeps happening to me.

Any idea what is happening?