When selecting the menu item
Tube the cursor changes its form. The
initial position of the continuous line is placed by a click on the
left mouse button and displayed by a selection point. After
positioning the mouse on the next corner point and following a
click it is also placed. The end point of the continuous line is
placed by a double click on the starting point. After selecting the
element the properties are displayed in the properties window.
For positioning the tube: If the element is selected and moved, the position of the cursor is recalculated. The basis is the original position of the element, which it had before moving. This position is the new position 0/0.
See also section Graphical Possibilities / Adding and removing corners.