Finalize the annotations and layout.

def _finalize_grid(self, *axlabels):
        """Finalize the annotations and layout."""
        if not self._finalized:
            self.set_axis_labels(*axlabels)
            self.set_titles()
            self.fig.tight_layout()

            for ax, namedict in zip(self.axes.flat, self.name_dicts.flat):
                if namedict is None:
                    ax.set_visible(False)

            self._finalized = True