LanguageTool integration was added in LO 7.4 with core commit d952df361a5e190246d7a0738ae5347b82cd57b5 Instructions to set it up are available at: https://languagetool.org/insights/post/product-libreoffice/#how-to-enable-languagetool-on-libreoffice Issues with the extension ( https://extensions.libreoffice.org/en/extensions/show/languagetool ), which pre-existed the integration, should usually be reported at https://github.com/languagetool-org/languagetool/issues