Meta Box

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//Shortcode Field Group
add_filter( 'rwmb_meta_boxes', 'depts_short_code_page' );

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

    $meta_boxes[] = [
        'title'          => __( 'Shortcode Page Name', 'depts_short_code_page' ),
        'id'             => 'shortcode-page-name',
        'settings_pages' => ['shortcode-page'],
        'fields'         => [
            [
                'name'       => __( 'Shortcode Page Name', 'depts_short_code_page' ),
                'id'         => $prefix . 'depts_shortcode_page',
                'type'       => 'post',
                'post_type'  => ['page'],
                'field_type' => 'select',
                'required'   => true,
                'columns'    => 4,
            ],
        ],
    ];

    return $meta_boxes;
}

//Shortcode Page Settings
add_filter( 'mb_settings_pages', 'short_code_page_settings' );

function short_code_page_settings( $settings_pages ) {
    $settings_pages[] = [
        'menu_title'  => __( 'Settings', 'short_code_page_settings' ),
        'id' => 'shortcode_page',
        'option_name' => 'shortcode_page',
        'position'    => 25,
        'parent'      => 'edit.php?post_type=department',
        'style'       => 'no-boxes',
        'columns'     => 1,
        'icon_url'    => 'dashicons-admin-generic',
    ];

    return $settings_pages;
}

add_filter( 'mb_settings_pages', 'short_code_page_settings' );

function short_code_page_settings( $settings_pages ) {
    $settings_pages[] = [
        'menu_title'  => __( 'Settings', 'short_code_page_settings' ),
        'option_name' => 'Shortcode Page',
        'position'    => 25,
        'parent'      => 'edit.php?post_type=department',
        'style'       => 'no-boxes',
        'columns'     => 1,
        'icon_url'    => 'dashicons-admin-generic',
    ];

    return $settings_pages;
}