Click the MPI Timeline tab if it is not already selected.
Zoom in on the data by clicking and dragging from the left to the right on any process row as shown by the directional arrow in the graphic below. When you release the mouse button, the area inside the box automatically expands to reveal a zoomed in view.
An alternative to clicking and dragging is to use the zooming slider controls in the top left of the timeline.
Use the horizontal slider to change the time scale. You'll see progressively smaller chunks of time, while still showing all the processes, as you zoom.
Use the vertical slider to zoom in on the MPI processes.
Click the Zoom Undo button in the MPI Timeline Controls tab shown below to go back to the previous level of zooming.
Click the Zoom Undo button a second time to return to the first zoom.
Pan across the data by sliding the scroll bars located at the bottom and the right of the timeline.
Alternatively you can toggle between a pointer that zooms and a pointer that pans by clicking the hand icon in the MPI Timeline Controls tab.
When the pointer is a hand, you can drag across the MPI Timeline to pan horizontally.