This is a list of all "form elements" or also called fields in the form.<br>The indentation represent the hierarchy of elements. There are elements that we call "layout element" like Tabs, Fieldset, and others which are used to define the layout of your form. Those you can modification and even create new ones.<br>The other elements are used to hold you data.<br><br>The area represent the specific area in the theme where the field will be rendered. Those area can be modified in the themes.<br><br>The type is there for information and can't not be changed.<br><br>If you unpublish an element it will not be visible to the user any more.<br>