By default, LDAP Administrator displays names of LDAP entries as their RDNs, because you can already see their parent entries in the tree, and the full DN entry
name becomes superfluous.
However, for various reasons some entries don't have their parents represented in the tree. These are called virtual entries.
For example, at times LDAP Administrator is forced to create top-level entries solely based on the namingContexts
attributes, not actually represented in the DIT. In this case, it is possible that RDNs of more than one entry are identical.
Or, when trying to locate an entry with the base DN of your server profile referring to another branch of the directory tree, such entry will be added as a child of your profile
and will not have its parent displayed in the tree.
The above examples explain why the application now offers an option of displaying full DNs for such entries - to help you distinguish those from the others by their actual DN.