Administration Guide : Security settings : Custom ACL Summary

Custom ACL Summary
The AFP/Access, Access Restriction (ACLs), Summary window provides information about existing ACLs on the server. .
You can edit or delete any custom ACL form the server from the Summary page. Simply click the appropriate icon associated with the ACL to do so. Take care when you delete a custom ACL, however. Deleting it will revert any use of the ACL to Local Hosts only.