sanitizeColumns example

'visible' => [
          'input[name="style_options[summary]"]' => ['filled' => TRUE],
        ],
      ],
      '#fieldset' => 'accessibility_details',
    ];

    // Note: views UI registers this theme handler on our behalf. Your module     // will have to register your theme handlers if you do stuff like this.     $form['#theme'] = 'views_ui_style_plugin_table';

    $columns = $this->sanitizeColumns($this->options['columns']);

    // Create an array of allowed columns from the data we know:     $field_names = $this->displayHandler->getFieldLabels();

    if (isset($this->options['default'])) {
      $default = $this->options['default'];
      if (!isset($columns[$default])) {
        $default = -1;
      }
    }
    else {