1.

In the Gantt Chart, position your cursor anywhere between the previous and forward navigation buttons

2.

Drag your mouse to the left if you would like to Zoom In to view the Gantt Charts previous months

3.

Or, Drag your mouse to the right if you like to Zoom Out to view the Gantt Chart Future months displayed

4.

Drag your mouse back to the original location to restore the view.

5.

The Zoom feature will Zoom out by decades, and Quarters and Zoom in by weeks, hours, and minutes