The system allows you to zoom-in on the graph narrowing the time range for a more granular view.
Adequate administrative permissions
Use the mouse.
To zoom in:Parent topic: Working with Graphs
Click on a start time any where on the graph, then drag your cursor to the end "time" to zoom into that period.
The graph will auto adjust and display only the selected time frame.
To zoom out:
Navigate to Navigation frame -> Search section press Reset.