Scaling clips lets you alter the length and speed of animation, character, camera animation, and video clips.
To scale a clip:

Story options A. Scaling is active
When you double-click a clip in the Story window, the clip’s settings display in the Asset Settings window. Some of these settings also let you scale a selected clip.

Asset Settings window A. In field B. Out field C. Clip Speed field
If you can not change the values in the
In and
Out fields, make sure the
In/Out Locked property is turned off. See
Locking story clips.
To scale a clip with the ripple manipulator
to turn on scaling.
The scaling icon
appears.
All of the subsequent clips move later on the timeline.
If dragging the ripple manipulator does not resize the clip, make sure the
In/Out Locked property is turned off. See
Locking story clips.