Why I cannot edit the End of the Previous-Segment?

If the Previous Segment is a Dwell or a Constant-Velocity.

AND you want the Position and Velocity to 'flow' from the Previous Segment.

 

In these cases, the Position and Velocity at the End of Previous-Segment must be specified at the START of the Previous-Segment.

 

Thus, you must make the Previous-Segment active (so it becomes the Selected-Segment) and then edit its Start-Position. The Position is also the End of the Selected-Segment because it is a Dwell!, and thus the start of the Next-Segment you want to edit.

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