code: public function form(array $form, FormStateInterface $form_state) {
      $form = parent::form($form, $form_state);
  
      // Hide status checkbox. We have the button.
      $form['status']['#group'] = 'footer';
  
      // Create sidebar group.
      $form['advanced'] = [
        '#type' => 'container',
        '#attributes' => ['class' => ['entity-meta']],
        '#weight' => 99,
      ];
  
      // Use the same form like node edit.
      $form['#theme'] = ['node_edit_form'];
      $form['#attached']['library'][] = 'seven/node-form';
  
      // Move relations into sidebar.
      $form['relations']['#group'] = 'advanced';
  
      // Move pathauto into sidebar.
      $term = $form_state->getFormObject()->getEntity();
      $form['path_settings'] = [
        '#type' => 'details',
        '#title' => t('URL path settings'),
        '#open' => !empty($form['path']['widget'][0]['alias']['#value']),
        '#group' => 'advanced',
        '#access' => !empty($form['path']['#access']) && $term->hasField('path') && $term->get('path')->access('edit'),
        '#attributes' => [
          'class' => ['path-form'],
        ],
        '#attached' => [
          'library' => ['path/drupal.path'],
        ],
        '#weight' => 30,
      ];
      $form['path']['#group'] = 'path_settings';
  
      return $form;
    }
docs: {@inheritdoc}