The key that will wrap the columns to include in the list.
The set of options that will determine how the list in the Sapwood UI is rendered for the template.
The first thing to know if that you don't have to use this option at all! You can omit this option entirely and Sapwood will still build a list.
And also note that if you are working with a public document template, then this option is ignored, as public documents are rendered in their own way.