You should be able to use this filter to set the order and orderby parameters of the query. https://www.advancedcustomfields.com/resources/acf-fields-post_object-query/
Here is code from ACF that shows the defaults used
// defaults $args = wp_parse_args( $args, array( 'posts_per_page' => -1, 'paged' => 0, 'post_type' => 'post', 'orderby' => 'menu_order title', 'order' => 'ASC', 'post_status' => 'any', 'suppress_filters' => false, 'update_post_meta_cache' => false, ));
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