Select "Path" mode from the toolbar. The editor options dialog will open that additionally prompts for basic path parameters, such as width and extension scheme. When a path is being drawn, it will receive the settings entered into this dialog. The path properties can even be changed, while the path is being drawn. Don't forget to click "Apply" to take over the current entries. If the dialog has been closed unintentionally, it can be reopened with the F3 shortcut.

To actually draw a path, choose a layer from the layer panel in which to create a new box. Left click at the first vertex, move the mouse to the second vertex, click to place this one and continue to the last vertex. Double-click at the last vertex to finish the path. Press the ESC key to cancel the operation.

For paths, as for polygons, the segments created are subject to certain direction restrictions as imposed by the connection angle constraints. See for a detailed description of the modes. Use the "editor options" dialog (F3 shortcut) to change the mode, also during editing.