If you want "optimized" column widths, I am afraid LibreOffice doesn't honor the XML markup. See http://lists.gnu.org/archive/html/emacs-orgmode/2014-01/msg01203.html
See http://lists.gnu.org/archive/html/emacs-orgmode/2014-02/msg00380.html Uwe Brauer <o...@mat.ucm.es> writes: > Hello > > I use org-odt-export-to-odt quite a bit. How can I configure it in order > to set a different column and row spacing for tables? The default one is to > large > for my taste, > > Thanks > > Uwe Brauer