TerrainEditor Window is missing

I am new to JMonkey and have installed it for the first time and run some samples just fine. Everything was as expected. But when I tried to follow this tutorial I ran into a problem; there doesn’t seem to be any TerrainEditor window. I can pull up my scene as “New Scene” as shown in the diagram but there is no TerrainEditor. It is not in the toolbar Window dropdown to be selected either.

I have uninstalled and reinstalled the plugin twice, as well as checked for updates. Could someone please show me what I’m missing? Thanks.

Right-click the file and select “Open in TerrainEditor”