You can easily remove a seam from an edge or line.
To remove a seam from an edge or line:
On the Main toolbar, click Select.
On the Horizontal contextual menu, ensure Pieces is selected.
In the 2D window, click on the edge or line to which the seam is assigned.
Go to the Context view, in the Materials section.
Click . A confirmation message is displayed.
Click Yes. The seam is removed.