After the Active Directory computers are synchronized to ESMC Web Console, you can filter computers that are not managed by ESET by filtering them in a generated report.
You have two options for removing client computers that are no longer available or are disabled in Active Directory:
If there are two computers with the same name and they are both listed in the Computers section of ESMC Web Console, these duplicate records are most likely caused by re-installation of the ESET Management Agent. Run the Delete Not Connecting Computers server task to remove the obsolete entry from ESMC Web Console.
To resolve computer name conflicts (duplicate computers) between computers already present in ESMC and those added via Active Directory synchronization, use the Active Directory Synchronization server task: in the Settings section, select Computer Creation Collision Handling → Move.