Create a field of "Drop-down single selection" for country

Hello, I made a "field" for users to select their country. I copied the country code from the link below:
www.freeformatter.com/iso-country-list-html-select.html

And pasted them like below:
in both "Profile Edit Layout" and "Registration Value Layout".



I successfully created a field of drop-down single selection for all the countries like below:


However, in the profile page, the country I selected from the drop-down never shows, please see below.


I checked the table called #_comprofiler_fields in my database, it's like below:



Anyone know what's wrong with this field I created? I want the country the user selected to show in the profile page. How can I make it happen?

That's not how profile value layout works. That's just to alter the display of a field. It has no storage behavior for your custom HTML. You need to have a database table with your countries then use CB Query Field to build a select field from that custom database table as shown in the below tutorial.

www.joomlapolis.com/documentation/345-cb-query-field/tutorials/18377-configuring-a-country-field-with-cb-query-field-plugin