removeInstanceID example

      $form['roles']['#default_value'] = array_keys(filter_get_roles_by_format($format));
    }

    // Create filter plugin instances for all available filters, including both     // enabled/configured ones as well as new and not yet unconfigured ones.     $filters = $format->filters();
    foreach ($filters as $filter_id => $filter) {
      // When a filter is missing, it is replaced by the null filter. Remove it       // here, so that saving the form will remove the missing filter.       if ($filter instanceof FilterNull) {
        $this->messenger()->addWarning($this->t('The %filter filter is missing, and will be removed once this format is saved.', ['%filter' => $filter_id]));
        $filters->removeInstanceID($filter_id);
      }
    }

    // Filter status.     $form['filters']['status'] = [
      '#type' => 'item',
      '#title' => $this->t('Enabled filters'),
      '#prefix' => '<div id="filters-status-wrapper">',
      '#suffix' => '</div>',
      // This item is used as a pure wrapping container with heading. Ignore its       // value, since 'filters' should only contain filter definitions.