Edit a Timeline

Click on the timeline line to divide it into two and make a new keyframe at the indicated frame. Double click on a keyframe indicator to call up the timeline's dialog box.

The default timeline extent covers any empty frames up to the keyframe. The length of a timeline and the frame number of the keyframe can be changed by dragging it to the left or right. As the keyframe is dragged any timeline next to it extends or contracts so that there is no gap between timelines.