There are three parameters in the X-axis Values separator.
SEGMENT START [Read-Only] : the X-axis value at the start of the Selected-Segment
SEGMENT WIDTH : Increase or decrease the Segment-Width. The end of the segment becomes later or earlier.
WARNING: As you edit the Segment-Width you will also edit the Motion-Width
SEGMENT END [Read-Only] : the X-axis value at the end of the Selected-Segment.
SEGMENT-EDITOR - X-axis Values - Segment-Width Parameter
All parameters MOTION-UNITS.
WARNING - if you edit the Segment-Width, the Motion-Width will also become different.
Thus, if the Motion-Width must be 360, you must edit the Segment-Width of at least two segments.