The synchronization is "one-way" - from Organic Groups to CiviCRM Groups "It doent support two-way" i.e if we add a new group or edit or subscribe/un-subscribe user from CIVICRM it wont get updated in drupal og group .

Once the module is enabled via Drupal Administer » Modules - for any new or re-saved Organic Group it will automatically create 2 CiviCRM groups: