If you're using a Timeline, you can create a marker and select a layout to show in the secondary VCS when the time cursor crosses the time of the marker.
In the Multigrid, you can use the Gear menu to specify a layout that should be displayed in the secondary VCS whenever the Multigrid is played.
If the Sound is not in a Timeline or Multigrid, open the Secondary VCS (from the File menu). Right click in the background of the secondary VCS and select the desired layout.