macOS 10.13
Change the time range for a timeline recording
Only data points inside the active selection range are shown in the Details section. There are several ways to adjust the active time range:
Drag in the timeline overview to make a new range selection.
Adjust the start and end of an existing selection range by dragging the start and end sliders in the ruler at the top of the timeline overview.
To shift a selection range forward or backward in time, drag inside the range in the ruler.
To clear the selection range, double click anywhere in the timeline overview or click the time range in the jump bar and choose Entire Recording from the pop-up menu that appears.