There are different colors that highlight what you are or can edited. They will wrap around them like a box.

Blue box are the section widths of the page ( full width or boxed )
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Green is the next box to add in columns within the blue section
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Orange boxes are content type elements within columns in a green box
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You can only move orange content type pieces within the same Green section. You cannot move them outside of the blue at this time.
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For a more in depth walk through please see video below.