Jeff,
You have to edit unigrid in CMSModules\Ecommerce\Pages\Tools\Customers\Customer_List.aspx
You have to add those columns to the list - I've added CustomerCountryID, CustomerStateID to the "Columns" at the end i.e.
<cms:UniGrid runat="server" ID="UniGrid" OrderBy="CustomerLastName" IsLiveSite="false"
Columns="CustomerID, CustomerLastName, CustomerCompany, CustomerFirstName, CustomerEmail, CustomerCreated, CustomerUserID, CustomerSiteID, CustomerCountryID, CustomerStateID"
ObjectType="ecommerce.customer" RememberStateByParam="">
and in the <GridColumns>
section you need to add:
<ug:Column Source="CustomerCountryID" Caption="Country" externalsourcename="#countryname" Wrap="false">
<Filter Type="text" />
</ug:Column>
<ug:Column Source="CustomerStateID" externalsourcename="#transform:cms.state:{%StateName%}" Caption="State" Wrap="false">
<Filter Type="text" />
</ug:Column>
See
https://docs.kentico.com/k10/references/kentico-controls/ui-controls/unigrid/reference-unigrid-definition for more info
P.S. Make sure that CustomerStateID, CustomerCountryID have values in your DB: SELECT CustomerStateID, CustomerCountryID from Com_customer