Can I force LibreOffice to use GTK theme in KDE?

Yes you can,depending on what libreoffice you are using (fresh or still) edit the file in /etc/profile.d/libreoffice-fresh.sh or /etc/profile.d/libreoffice-still.sh and delete the # in front of export SAL_USE_VCLPLUGIN=gtk3,save and restart libreoffice,sometimes is required to logout/restart to take effect.

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