The base lists for a profession are automatically offered as skills in a new character, since most likely they will be learned at one point or another.
The reason the open and closed lists are not added by default is to avoid a lengthy list of skills which the character might never even consider learning, worse still for semi and non-spell users. And for hybrids the list would be even more difficult to manage.
In that spirit, if a character wants to learn a non-base spell list, you just need to add it as a new skill in the corresponding category (check
this point of the tutorial video).
As soon as it's added, spell lists skills will show the book icon to get a list of the spells.
Let me know if that works for you, and thanks for your interest in ERA!