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If this functionality is in there do you have any clues what it's called or where I can find it?

turns out the content area receives it by default, but elemental removes the field

Oh right you'll need to apply updateCMSFields to the element rather than the page

make the HTMLEditorField 100% wide under the label

"stacked" still works on TextAreaFields, haven't tried it on HTMLEditorFields though

upgrade to elemental 4 - problems all solved :P