ddangelillo is close. If you put a comma after ‘post_type’ => $this->settings[‘post_types’] on line 221 and add a line below with the same ‘posts_per_page’ => -1 it will work as you’d expect. That’s the query that actually gets the data for the export. By default WP_Query uses the setting in Settings >> Reading >> Blog pages to show at most if that property isn’t set.
