To restore the default DNS records, perform the following steps:
1 – Logged in to Plesk.
2 – Go to Websites & Domains.
3 – Click DNS Settings.
4 – Click Reset to Default.
5 – Click OK.
NOTE: This will undo all the changes made to the DNS zone and recreate it according to the server-wide DNS template. Note that any custom records you may have added to the zone will be lost.