<?php
<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );
function your_prefix_register_meta_boxes( $meta_boxes ) {
    $meta_boxes[] = array (
      'title' => 'Settings_temp',
      'id' => 'settings-temp',
      'post_types' =>   array (
         'page',
      ),
      'context' => 'normal',
      'priority' => 'high',
      'status' => 'publish',
      'autosave' => false,
      'fields' =>   array (
     array (
      'id' => 'group_2',
      'type' => 'group',
      'name' => 'Group',
      'fields' =>       array (

        array (
          'id' => 'checkbox_1',
          'name' => 'Checkbox',
          'type' => 'checkbox',
          'desc' => 'Default Description',
        ),

        array (
          'id' => 'group_3',
          'type' => 'group',
          'name' => 'Group',
          'fields' =>           array (

            array (
              'id' => 'checkbox_2',
              'type' => 'checkbox',
              'desc' => 'This is some long title',
              'columns' => 3,
            ),

            array (
              'id' => 'checkbox_3',
              'type' => 'checkbox',
              'columns' => 1,
            ),

            array (
              'id' => 'checkbox_4',
              'type' => 'checkbox',
              'columns' => 1,
            ),

            array (
              'id' => 'checkbox_5',
              'type' => 'checkbox',
              'columns' => 1,
            ),

            array (
              'id' => 'checkbox_6',
              'type' => 'checkbox',
              'columns' => 1,
            ),

            array (
              'id' => 'checkbox_6',
              'type' => 'checkbox',
              'columns' => 1,
            ),

            array (
              'id' => 'checkbox_7',
              'type' => 'checkbox',
              'columns' => 1,
            ),

            array (
              'id' => 'checkbox_8',
              'type' => 'checkbox',
              'columns' => 1,
            ),

            array (
              'id' => 'checkbox_9',
              'type' => 'checkbox',
              'columns' => 2,
            ),
          ),
          'default_state' => 'expanded',
          'groupfield' => 'text',
        ),
      ),
      'default_state' => 'expanded',
      'groupfield' => 'text',
      'tab' => 'tab_1',
    ),

    array (
      'id' => 'text_3',
      'type' => 'text',
      'name' => 'Text Field',
      'std' => 'Logged Out Users',
      'required' => 1,
      'tab' => 'tab_1',
    ),
  ),
  'tab_style' => 'default',
  'tab_wrapper' => true,
  'tabs' =>   array (
    'tab_1' =>     array (
      'label' => 'Tab',
      'icon' => '',
    ),
  ),
);
return $meta_boxes;
}