Filter posts on ACF Relationship field based on Options page

acf-relationship-filter-options-page.php

<?php
/**
 * Filter posts queried on ACF Relationship field based on Options page
 * Filter : https://www.advancedcustomfields.com/resources/acf-fields-relationship-query/
 * $post_id : The Options page 'post_id' setting specified in acf_add_options_page
 *
 */

//Modify which posts are queried based on Options page
add_filter('acf/fields/relationship/query/name=field_name', 'modify_rel_field_post_query', 10, 3);
function modify_rel_field_post_query( $args, $field, $post_id ) {
	if( 'options_1' == $post_id ) {
		$args['post_type'] = array('post');
		return $args;
	}elseif( 'options_2' == $post_id ) {
		$args['post_type'] = array('page');
		return $args;
	}
}