Using the context menu an input of inner or outer geometry as polyline can be activated. This is usually done after setting a background drawing, but is independent of it.
Using the left mouse button, points for the polyline can be added. A red line shows an invalid position for the next point and this will not be accepted. Using Shift plus left button the last selected point is removed again. The right mouse button is used to stop the input and the result is set to the table for inner or outer geometry.
The selected points are rounded to a millimeter.