The selected topic is on the left. Connections are to the right; drag the graph to see them.
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.
Drag to pan. Scroll to zoom. Click to select. Double-click to open.