OS: kubuntu 18.04, screen resolution: 2560x1440 fonts in context menus (and fonts in dialogs, for example in "extra - options") are very tiny & hard on the eyes (much smaller than the "normal" system fonts in context menus). Problem only affects kde-integration - gnome - gtk-version: fonts are as before & as big or small as fonts in context menus throughout the system.
This problem should be fixed with the next release: https://cgit.freedesktop.org/libreoffice/core/commit/?h=libreoffice-6-2&id=7cef089465c3e0038c3e5a5606ad9b9d7dfb5acd