Along the side are the various actions or views you can take. From the top, these are:
Run Query (run the query)
Gizmo (a dropdown, to pick your query language, MQL is the other)
GizmoAPI.md: This is the one of the two query languages used either via the REPL or HTTP interface.
MQL.md: The other query language the interfaces support.
Query (a request/response editor for the query language)
Query Shape (a visualization of the shape of the final query. Does not execute the query.)
Visualize (runs a query and, if tagged correctly, gives a sigmajs view of the results)
Write (an interface to write or remove individual quads or quad files)
Documentation (this documentation)
To use the visualize function, emit, either through tags or JS post-processing, a set of JSON objects containing the keys source and target. These will be the links, and nodes will automatically be detected.
Other keys are ignored. The upshot is that if you use the "Tag" functionality to add "source" and "target" tags, you can extract and quickly view subgraphs.
The visualizer expects to tag nodes as either "source" or "target." Your source is represented as a blue node. While your target is represented as an orange node. The idea being that our node relationship goes from blue to orange (source to target).