Apple Logic Express 8 - Manual (Page 720)

720 Chapter 33 Working With Notation
Page Break and Line Break Symbols
Break symbols (and No Line Break and No Page Break objects) can be inserted as
events. Once inserted, they can not be moved automatically (when you alter the Layout
project settings, resize the window, and so on).
You can overrule the Line Break, Page Break, No Line Break, and No Page Break events
with the Layout tool.
Line breaks and individual staff margins can be determined for each score set, and also
for each of the extracted parts.