Altering "item" paragraph

/**
 * Implements hook_field_widget_form_alter().
 */
function mytheme_field_widget_form_alter(&$element, $form_state, $context) {

  $plugin_id =  $context['widget']->getPluginId();
  $paragraph_type = isset($element['#paragraph_type']) ? $element['#paragraph_type'] : FALSE;
  $parent_bundle = isset($element['#bundle']) ? $element['#bundle'] : FALSE;
  $hidden_fields = [];
  $group_links = FALSE;
  $top_label = FALSE;
  if ($plugin_id == 'paragraphs' && !isset($element['preview'])) {
    // All fields.
    // $hidden_fields = ['field_title', 'field_image', 'field_node', 'field_link', 'field_icon', 'field_html'];

    if ($paragraph_type == 'item') {
      switch ($parent_bundle) {
        case 'accordion':
          $hidden_fields = ['field_image', 'field_node', 'field_link', 'field_icon'];
          $top_label = 'Accordion item';
          $group_links = FALSE;
          break;
        case 'cta':
          $hidden_fields = ['field_title', 'field_image', 'field_icon'];
          $top_label = 'Call to action';
          break;
        case 'links':
          $hidden_fields = ['field_title', 'field_image', 'field_icon', 'field_html'];
          $top_label = 'Link';
          $group_links = TRUE;
          break;
        case 'stepper':
          $hidden_fields = ['field_image', 'field_node', 'field_link', 'field_icon'];
          $top_label = 'Step';
          break;
        case 'curated':
          $hidden_fields = ['field_image', 'field_icon'];
          $top_label = 'Tile';
          break;
        default:
          break;
      }
    }

    foreach ($hidden_fields as $hide) {
      if (isset($element['subform'][$hide])) {
        $element['subform'][$hide]['#access'] = FALSE;
      }
    }

    if ($top_label) {
      $element['top']['type']['label']['#markup'] = '<span class="paragraph-type-label">' . $top_label . '</span>';
    }

    if ($group_links) {
      $isset_field_node = FALSE;
      if (isset($element['subform']['field_node']['widget']['#default_value']) && count($element['subform']['field_node']['widget']['#default_value'])) {
        $isset_field_node = TRUE;
      }

      $element['subform']['linknode'] = [
        '#type' => 'vertical_tabs',
        '#default_tab' => $isset_field_node ? 'edit-tab-node' : 'edit-tab-link',
      ];

      $element['subform']['tab_node'] = [
        '#type' => 'details',
        '#title' => 'Content page',
        '#group' => 'linknode',
        '#open' => $isset_field_node ? TRUE : FALSE,
      ];
      $element['subform']['tab_node']['field_node'] = $element['subform']['field_node'];
      unset ($element['subform']['field_node']);

      $element['subform']['tab_link'] = [
        '#type' => 'details',
        '#title' => 'Other link',
        '#group' => 'linknode',
        '#open' => $isset_field_node ? FALSE : TRUE,
      ];
      $element['subform']['tab_link']['field_link'] = $element['subform']['field_link'];
      unset ($element['subform']['field_link']);
    }

  }

}