Rotate Horizontally
You can use the Rotate Horizontally tool to rotate a piece by a selected segment (without changing its baseline position), so that the piece's selected segment is parallel to the X axis.
Icon & Location
To rotate to horizontal:
-
activate the Rotate Horizontally tool.
The cursor changes to:

-
Select the first point on the contour:

-
Click the second point on the contour (clockwise) :

The piece is rotated so that the selected segment is parallel to the
X axis.
See also: