Customizing your connection lines
You can toggle between drawing your connection lines as solid or dashed. Having different style connection lines can help organize a larger node network.
Select a connection line and 
-click for the marking menu and select Tools > Toggle Connection Draw Style.
You can also draw your connection line as a different style. Press 
+
and drag on a connection line to create a visually different connection line.
Reverting to default
To revert your custom line style to default, select the line, -click for the marking menu and select Reset Connection.