If your organization is very large, it's unlikely that you can view the entire organization at once on your screen. There are two options for how you move the org chart to view different portions of it within your browser window.
Follow these instructions to choose/change how you move/pan the org chart:
On the org chart page, click the Options icon (looks like a gear).
Find the Mouse/Trackpad Options setting in the list.
Choose whether you prefer to click and drag to move the chart, or scroll to move the chart. The scroll option works best with a trackpad where you typically use a two-finger motion to scroll either horizontally or vertically
Feel free to try out both options to see which one you personally prefer!