Primary domain in "Culture and Hostnames"

Hi,

I need set/mark primary domain in “Culture and Hostnames”.
I have multiple domains on one page, and I would like to generate UMB links by primary domain, not by recently added domain.

How can I do that?

Thanks.


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/106442-primary-domain-in-culture-and-hostnames