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I'm wondering how I can make the center line between two pages disappear, for example:
You cannot turn off the black line as that indicates the edge of the page for facing pages.
But you can turn off Overprint Preview by making sure it is unchecked under View -> Overprint Preview. Objects that are over the 2 facing pages will not show the black line.
Obviously, this black guide will still show up where no block is overlapping.
Required, but never shown