In the “search for someone” box at the top of every page how to we search for all profiles that are at a domain like @mycompany.com or @mcdonalds.com?

We can only search by email handle, like johnsmith and janesmith.  We don’t seem able to search by the domain.  So if one of our profiles is johnsmith@mycompany.com we can only find that profile by searching for  johnsmith (or a fragment of that).  We can’t find it by @mycompay.com.

Seems weird.  We often want to find all profiles for specific domain names.