To switch off the Plesk's DNS service for a site served by external name servers, perform the following steps:
1 - 1 - Logged in to Plesk, https://your domain name:8443.
2 - Go to Websites & Domains and click the domain name whose DNS settings you want to manage.
3 - Click DNS Settings.
4 - Click Disable.
Turning the DNS service off for the zone will refresh the screen, so that only a list of name servers remains.
5 - If you want to validate the configuration of a zone maintained on authoritative name servers, do the next step.
6 - Add to the list the entries pointing to the appropriate name servers that are authoritative for the zone: Click Add Record.
7 - Specify a name server, click OK.
8 - Click Update.
