How to add more into subpanels?


Where is it determined which fields can used in the different subpanels under accounts?
Within the contact panel under account, I would like to make use of the field “first_name” and “last_name”, but they are not shown. It’s only possible to use either the “name” or “full_name”, which gives the full name.
I would like to separate the first name and last name in different rows.

Is this possible? If so how.

See this

and in general, anything referring to subpanels directory, or subpaneldefs.php files.