Clone default value

<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );

function your_prefix_register_meta_boxes( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = array (
        'title' => esc_html__( 'Group', 'text-domain' ),
        'id' => 'group',
        'post_types' => array(
            0 => 'post',
        ),
        'context' => 'normal',
        'priority' => 'high',
        'fields' => array(
            array (
                'id' => $prefix . 'group',
                'type' => 'group',
                'name' => esc_html__( 'Group', 'text-domain' ),
                'fields' => array(
                    array (
                        'id' => $prefix . 'radio',
                        'name' => esc_html__( 'Radio', 'text-domain' ),
                        'type' => 'radio',
                        'std' => 'home',
                        'options' => array(
                            'organisation_this' => esc_html__( 'This organisation', 'text-domain' ),
                            'organisation_other' => esc_html__( 'Other organisation', 'text-domain' ),
                            'home' => esc_html__( 'Home address', 'text-domain' ),
                        ),
                        'clone' => 1,
                        'clone_default' => 1,
                    ),
                    array (
                        'id' => $prefix . 'text',
                        'type' => 'text',
                        'name' => esc_html__( 'Text Field', 'text-domain' ),
                        'std' => 'Default text',
                        'clone_default' => 1,
                    ),
                    array (
                        'id' => $prefix . 'checkbox',
                        'name' => esc_html__( 'Checkbox', 'text-domain' ),
                        'type' => 'checkbox',
                        'desc' => esc_html__( 'Default Description', 'text-domain' ),
                        'std' => 1,
                    ),
                    array (
                        'id' => $prefix . 'checkbox',
                        'name' => esc_html__( 'Checkbox List', 'text-domain' ),
                        'type' => 'checkbox_list',
                        'std' => 3,
                        'options' => array(
                            1 => esc_html__( '1', 'text-domain' ),
                            2 => esc_html__( '2', 'text-domain' ),
                            3 => esc_html__( '3', 'text-domain' ),
                        ),
                        'clone' => 1,
                        'inline' => 1,
                        'clone_default' => 1,
                    ),
                    array (
                        'id' => $prefix . 'select',
                        'name' => esc_html__( 'Select Field', 'text-domain' ),
                        'type' => 'select',
                        'std' => 2,
                        'placeholder' => esc_html__( 'Select an Item', 'text-domain' ),
                        'options' => array(
                            1 => esc_html__( '1', 'text-domain' ),
                            2 => esc_html__( '2', 'text-domain' ),
                            3 => esc_html__( '3', 'text-domain' ),
                            4 => esc_html__( '4', 'text-domain' ),
                        ),
                        'clone' => 1,
                        'clone_default' => 1,
                    ),
                    array (
                        'id' => $prefix . 'select_advanced',
                        'name' => esc_html__( 'Select Advanced', 'text-domain' ),
                        'type' => 'select_advanced',
                        'std' => 'c',
                        'placeholder' => esc_html__( 'Select an Item', 'text-domain' ),
                        'options' => array(
                            'a' => esc_html__( 'A', 'text-domain' ),
                            'b' => esc_html__( 'B', 'text-domain' ),
                            'c' => esc_html__( 'C', 'text-domain' ),
                            'd' => esc_html__( 'D', 'text-domain' ),
                        ),
                        'clone' => 1,
                        'clone_default' => 1,
                    ),
                ),
                'clone' => 1,
                'default_state' => 'expanded',
                'clone_default' => 1,
                'collapsible' => true,
            ),
        ),
    );

    return $meta_boxes;
}