Sorry for the delayed response.

Currently, you can export all orders or a selection using the checkboxes. We plan to redesign the orders section, and I'll ensure the feature you need is included.

I can provide you with temporary solution to this:

Open file /includes/woocommerce/class.rest-orders-controller.php

Find the function export_orders (line 224) and replace it with the one I've pasted below.

public function export_orders($request) {
        $includes = $request->get_param('include');
        $wc_export = new WC_Export();
        if ($includes) {
            $ids_array = explode(',', $includes);
            $wc_export->set_by_ids($ids_array);
        }
        if (!$includes) {
            $args = array(
                'return'           => 'ids',
                'posts_per_page'   => -1,
                'orderby'          => 'date',
                'order'            => 'DESC',
                'meta_key'         => 'stec_has_tickets',
                'meta_value'       => '1',
                'meta_compare'     => '='
            );
            if (!current_user_can('stec_edit_orders')) {
                $args['customer_id'] = get_current_user_id();
            }
            $ids       = array();
            $order_ids = wc_get_orders($args);
            if (is_wp_error($order_ids)) {
                $ids = array();
            }
            foreach($order_ids as $order_id) {
                $order_tickets = Booking::get_tickets_from_order($order_id);
                foreach ($order_tickets as $ticket) {
                    $ids[] = $order_id . '-' . $ticket->get_id();
                }
            }
            $wc_export->set_by_ids($ids);
        }
        $wc_export->download_csv();
}