Story Map Tour applications in ArcGIS Online are unable to display line and polygon layers until panning or zooming the map when the integrated layout is used.
I can't reproduce this issue in Chrome but it sounds like others have been able to. Mark Cooney spent some time looking at this issue, and was able to reproduce, he was not able to find a viable solution. He thinks we will have to mark this as a known issue with the integrated layout and recommend using the three-panel layout as a workaround.
解决办法
Use the three-panel layout instead of the integrated layout.