In Roadmaps Overview "Folders" left navigation area is missing Folder Tree capability

The sub folder created in a folder in Roadmaps is not possible to see in the left navigation area. No expand functionality is available to expand the folder structure.

Current behaviour: Just when selecting the folder the user can see in the canvas on the right side that within the folder is a sub folder available.

This is a limitation in the left navigation area and would be a useful enhancement with providing functionality to expand the folder structure.