The Make Selected Same Size button makes all selected events the same size as the current event.
When you select two or more range bars, the last one selected is the current event. The end boxes of the other events are white, while the end boxes of the current event are red. When you click Make Selected Same Size, the current event stays in place, and the remaining selected events are expand or shrink to cover the same number of frames.
To change the number of frames in an event, do one of the following: