THEMENAME.theme

/**
 * Implements hook_preprocess_HOOK() for page title templates.
 */
function THEMENAME_preprocess_page(&$variables) {
  $node = \Drupal::request()->attributes->get('node');
  if (isset($node) && $node instanceof Node) {
    // Check node types and remove the block title.
    switch ($node->getType()) {
      case "bio":
      case "form":
      case "page":
      case "product":
      case "product_subpage":
      case "static_page":
      case "support_download_page":
        unset($variables['page']['title']);
        break;
    }
  }

  // Unset the page title for webform thank you pages.
  $route_id = \Drupal::routeMatch()->getRouteName();
  if ($route_id === 'sophos_webform_confirmation.confirmation') {
    unset($variables['page']['title']);
  }
}