example code for caldera_forms_pro_send_local filter. https://calderaforms.com/doc/caldera_forms_pro_send_local/

caldera_forms_pro_send_local.php

<?php
/**
 * Force one form NOT TO send with Caldera Forms Pro
 */
add_filter( 'caldera_forms_pro_send_local', function( $send_local, $form_id ) {
    if( 'CF123456' === $form_id ){
        return true;

    }

    return $send_local;
},10,2);

/**
 * Force one form TO send with Caldera Forms Pro
 */
add_filter( 'caldera_forms_pro_send_local', function( $send_local, $form_id ) {
    if( 'CF123456' === $form_id ){
        return false;

    }

    return $send_local;
},10,2);

/**
 * Force all forms NOT TO send with Caldera Forms Pro
 */
add_filter( 'caldera_forms_pro_send_local', '__return_true' );

/**
 * Force all forms TO send with Caldera Forms Pro
 */
add_filter( 'caldera_forms_pro_send_local', '__return_false' );