Analyze a region of time with the cross-section marker
To select a range of time to investigate more closely, click anywhere on the timeline and drag the handles on the cross-section marker. The information shown in the details panel when in Processes mode or Samples mode updates to show data for the window of time you have defined.
To move the view so the selected range is in the center, click Center the display on the cross-section marker 
on the toolbar of the Live view or the Timeline view.
If you select a time range, then change the scale of the view so the cross-section marker cannot sit precisely, the border appears as a blurred line.
Note
Unlike the filter controls, moving and expanding the cross-section marker does not affect the data in the other report views. To focus the data in the other views, use the calipers instead.
You can also control the cross-section marker with contextual menu options and keyboard shortcuts:
Set the cross-section marker, or one end of it, to a specific time index with the corresponding contextual menu option.
Move the cross-section marker with the left and right arrow keys on your keyboard.
Adjust the range that the cross-section marker covers by holding down Shift while pressing the arrow keys.