You can set the stacking order of pieces relative to other elements. For example, above or below an internal line.
To change the stacking order:
On the Main toolbar, click Select.
On the Horizontal contextual menu, ensure Pieces is selected.
In the 2D window, click the piece you want to edit.
Go to the Context view, in the Actions section, at Order.
Adjust the order as required.
Click to put the piece to the top.
Click to move the piece up one layer.
Click to put the piece to the bottom.
Click to move the piece down one layer.