UI
Graph Panel
There are several buttoms

New Graph
New will clean the canvas.
Save Graph
Save the graph into json to your computer.
Load Graph
Read the graph json from your computer.
SugGraph Panel
subgraphs select

change to edit specific subgraph
subgraph control

Add
Add new subgraph
Load Subgraph
upload a subgraph
Save Subgraph
save single subgraph