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Change the zero point
The zero
point is the position at which the zeros on the
horizontal and vertical rulers intersect. By default, the zero point
is at the top left corner of the first page of each spread. This
means that the default position of the zero point is always the
same relative to a spread, but may seem to vary relative to the
pasteboard.
The X and Y position coordinates in the Control
panel, Info panel, and Transform panel are displayed relative to
the zero point. You can move the zero point to measure distances,
to create a new reference point for measurement, or to tile oversized
pages. By default, each spread has one zero point at the upper left corner
of the first page, but you can also locate it at the binding spine,
or specify that each page in a spread has its own zero point.
Adjust the zero pointWhen you move the zero point, it moves to
the same relative location in all spreads. For example, if you move
the zero point to the top left corner of the second page
of a page spread, it will appear in that position on the second
page of all other spreads in the document.
 Do one of the following:To move the zero point, drag from the intersection
of the horizontal and vertical rulers to the position on the layout
where you want to set the zero point.
 Establishing a new zero point To reset the zero point, double-click the intersection
of the horizontal and vertical rulers  .
To lock or unlock the zero point, right-click (Windows)
or Control-click (Mac OS) the zero point of the rulers,
and choose Lock Zero Point or Unlock Zero Point in the context menu.
Change the default zero pointUsing the Origin setting in the Preferences
dialog box, you can set the default zero point for rulers as well
as the scope of the horizontal ruler. The scope determines
whether the ruler measures across the page, across the entire spread,
or, for multipage spreads, from the leftmost page to the spine and
from the spine outward.
If you set the ruler origin at each
spread’s binding spine, the origin becomes locked at the spine.
You won’t be able to reposition the ruler origin by dragging it
from the intersection of the rulers unless you choose another origin
option.
- Choose
Edit > Preferences > Units & Increments
(Windows) or InDesign > Preferences >
Units & Increments (Mac OS).
- In the Ruler Units section, in the Origin menu, do one
of the following:
To set the ruler origin at the top-left
corner of each spread, choose Spread. The horizontal ruler measures
across the entire spread.
To set the ruler origin at the top-left corner of
each page, choose Page. The horizontal ruler starts at zero for
each page in a spread.
To set the ruler origin for multipage spreads on
the top-left corner of the leftmost page, as well as at the top
the binding spine, choose Spine. The horizontal ruler measures from
the leftmost page to the binding edge, and from the binding spine
to the rightmost page.
 You can also change horizontal ruler
origin settings using the context menu that appears when you right-click
(Windows) or Control-click (Mac OS) the horizontal ruler.
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PDF (adobe.com)
