Logic Pro for Mac 11.1
When you add an arrangement marker, it’s eight bars long. You can resize it to cover the section of the project you want it to include, and you can rename it to reflect its place in the project.
In Logic Pro, click the Add Arrangement Marker button (+) in the arrangement track (or use the Create Arrangement Marker key command).
The arrangement marker appears at the start of the project or at the end of the last existing arrangement marker.
You can resize arrangement markers. When you resize the point where two adjacent arrangement markers meet, both arrangement markers are resized accordingly.
In the Logic Pro arrangement track, place the pointer over the edge of an arrangement marker.
For two adjacent arrangement markers, the pointer changes to a Junction pointer. For the beginning of the first arrangement marker or the end of the last arrangement marker, the pointer changes to a Resize pointer.
Drag the marker edge to the new position.
In Logic Pro, do one of the following:
Click the name of the selected arrangement marker, then choose a name from the shortcut menu.
Double-click the marker (except the name), then enter a new name.