You can constrain the time span shown in the timeline. In the top pane of the
Timeline panel, the portion of time displayed in the lower
pane is represented by a white background. Two gray slider handles at the top left and
right edges of this white background allow you to increase or decrease the selected
timespan displayed in the timeline.
- Click the Timeline icon on the toolbar to display the Timeline panel.
- If necessary, record the browser engine activity to generate timeline data.
- In the top pane of the Timeline panel, click and drag a gray slider handle to increase or decrease the time span.