Continuous Zoom with the Zoomer Tool
Use the Zoomer tool to zoom in or out continuously.
To use continuous zoom on one track or a group of tracks:
1. Select the Zoomer tool.
2. Hold the Control (Mac) or Start key (Windows) and do one of the following:

Drag to the right to continuously zoom in horizontally.

Drag to the left to continuously zoom out horizontally.
For horizontal zoom, all tracks zoom together. Tracks will zoom in or out centered horizontally on the location where you click.