Confirm that you wish to remove the DNS server/DNS servers by selecting the Confirm Removal checkbox, and then click OK.
See Also
Managing Centralized DNS Servers
Preparing DNS Server for Registration
Registering New DNS Server in Plesk Expand
Setting SOA Parameters for Several DNS Servers
Administering Centralized DNS Server
Editing SOA Record Parameters
Switching Modes of DNS Servers
Reloading DNS Server
