If LDAP Sync was previously enabled and the desire is to remove the configuration completely to prevent an accidental run, it is possible to manually remove the configuration. Unfortunately, this cannot be done from the Enterprise Gateway console.
To remove the configuration:
C:\Program Files (x86)\Symantec\VIP_Enterprise_Gateway\LdapSync\services\)
Upon logging back into the EG console the default activation options should appear under User Store > LDAP Directory Synchronization.