Hi David,
The answer to the question: –
If you want to build a full width page, use the option below to remove the page width, margin and padding.
Make page full-width.
My mistake Jack was an Editor.
This setting is only available to those users who are administrators. Feels making this only available in Administrator mode is a bit odd. My friend Jack, I set him up as an editor hence he could not see it. As soon as he was an admin he could.
Everyday is a learning day.