Options

The Options menu holds the QAequilibraE settings that are not tied to a single procedure. They apply to whichever project is open, and each choice is remembered across QGIS sessions rather than being stored with the model.

Break links at nodes while digitizing

Ticked, a link drawn across nodes it snapped to along the way is saved as one link per stretch between them, so the network stays connected at each of those nodes. Unticked, the link is saved exactly as drawn, as a single feature running over the top of them.

The full behavior, including what it does with attributes and link ids, is described in editing networks.