Layout & structure
These fields organise the edit screen — they don't store a value and there's nothing to read in your theme. Drop them between other fields to group and explain them.
Tab Free
Splits a long field group into tabs. Every field after a Tab belongs to it, until the next Tab.
Configure
The tab label, and placement (top or left). Add several Tabs to create a tabbed edit screen.
Stores
Nothing — it's a visual divider.
Accordion Free
A collapsible section. Fields after it fold away under a heading until the next Accordion (or its "endpoint").
Configure
The heading, whether it starts open, and whether it's multi-expand.
Stores
Nothing.
Message Free
A block of read-only text or instructions shown to editors on the edit screen.
Configure
The message body (basic HTML allowed), and whether to escape it.
Stores
Nothing.
Separator Free
A simple horizontal rule to visually break up a group.
Configure
Nothing to configure — just add it where you want the line.
Stores
Nothing.