When
selecting a guide in the list, you can change its settings underneath
Orientation:
Vertical or Horizontal
Relative to:
the page box used as reference, or another guide
Anchor Point:
The reference point on the page box. Top/Center/Bottom for Horizontal
guides, Left/Center/Right for Vertical guides.
Guide Name: if Relative
to is set to "Other Guide", you can select a guide from
the dropdown. Only guides with the same orientation will be available.
Moving a guide will also move the guide(s) that are "Relative to"
this guide.
Note:
If the "Relative to" guide is removed, the depending
guide’s settings will change to Relative to Media box
Offset: Distance
from the reference point. A positive value is to the top/right,
a negative value to the bottom/left.
Mirror on even pages (only for
vertical guides): mirror the guide horizontally over the center
line of the crop box on even pages