The Erase allows to delete Sliced Contour Segments. It can also be selected temporarily or permanently by pressing
E or Shift + E, respectivelyon the keyboard.
Note that you need to have a Sliced Contours Object in the image composition tree and must select it for editing.
Hold the Shift key and press the left button of the mouse near of of the contour points of the segment you want to erase. You can only erase contour segments that belong to the Slice Contours Object selected for editing in the image composition tree.