The details you will see under System tab than group details.
How is your top level synchronization type configured?
There has beens BUG since EPO 4.5-4.6.4 in the Active Directory Sync structure if you DO not go over an LDAP Server.
Here is how to ADD a LDAP Server as OBJECT in EPO
Menu > Configuration > Registered Server
Now configure you Server (Maybe make an Extra LDAP Access account so you don't have to choose the "administrator". Because if you once have to change the Admin password it will stuck. (Only options for large box)
Now in the SYNC Tab for your group/System Strcuture CHOOSE "Registered LDAP Server".
If you choose the options "Use Domain/Domäne verwenden" it will not fully work!