code: public function registerCpUrlRules(RegisterUrlRulesEvent $event)
      {
          // only register CP URLs if the user is logged in
          if (!\Craft::$app->user->identity)
              return;
          
          $rules = [
  
              // register routes for the settings tab
              'settings/sitemap' => [
                  'route'=>'sitemap/settings',
                  'params'=>['source' => 'CpSettings']],
              'settings/sitemap/save-sitemap' => [
                  'route'=>'sitemap/settings/save-sitemap',
                  'params'=>['source' => 'CpSettings']],
          ];
          $event->rules = array_merge($event->rules, $rules);
      }
docs: Register CP URL rules
  
  @param RegisterUrlRulesEvent $event