ETC Congo Family v6.4.0 - Manual (Page 438)

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Sequences - Section Markers (6.3)
You can organize the contents of a sequence visually by setting section markers that will
provide a blue heading. In addition to this you can jump between section markers.
The quickest way to apply or remove a section marker is using the context menu (right-click
over a sequence step in the Playback tab).
You can see and set the section markers in the sequence editor as well - in the column at
the far right