Apple Logic Express 8 - Manual (Page 741)

Chapter 33 Working With Notation 741
The Alternate Repeat Symbols (for the whole project) option in File > Project Settings >
Score > Global activates a real book style display of repeat signs.
Bar Repeat Signs
The one or two bar repeat symbols replace all notes and rests in the corresponding
measures. All other symbols remain visible. This does not affect MIDI playback, so
hidden notes can still be heard. These signs can only be moved in the Event List or
Event Float window.
Double Repeat Sign
The double repeat sign behaves as expected, unless it is positioned at a line break. In
this situation, it is automatically displayed as two back to back repeat signs.