Zooming and navigating track views
It is possible to zoom in and out with the zoom tools in the lower right-hand corner of the View Area, or by using a mouse scroll wheel while pressing the Ctrl ( on Mac) key. If you want to zoom in to 100 % to see the data at base level, click the Zoom to base level () icon.
If you want to zoom out to see all the data, click the Zoom to Fit () icon. When zooming out you will see that the data is visualized in an aggregated format using a density bar plot or a graph.