Datasheet

34 Working with Pages
The small tab
that is shown on the intersection button can be used to set a
new ruler origin—simply drag the tab onto the page and release to set the
position of your new origin (cross-hair guides and the Hintline toolbar help this
positioning). Double-click on the intersection to reset the origin back to its
default position. All guide positions are recalculated as the origin changes
position.
Double-click on the ruler intersection to make the rulers' zero point jump to the
top left-hand corner of the selected object.
This comes in handy for measuring page objects. If the rulers have already been
moved or the object is deselected, double-clicking on the intersection will send
the rulers back to the default position.