How to make Plesk available at only one domain?

Hi,

the default setting is that each of the hosted domains can be used to access the Plesk panel: domain1.tld:8443, domain2.tld:8443, ... And the chosen domain remains all the time in the address bar.

But I can only use 1 valid ssl certificate for the Plesk domain - so I've chosen my domain1.tld. Now there's a green lock when I use domain1.tld:8443, but an unsecure connection when I use domain2.tld.

I want to enforce that only domain1.tld can be used to access the Plesk panel at :8443,...

How to make Plesk available at only one domain?