When the mouse pointer is upon the start or end point of the selected wall, it changes to indicate
you can drag and drop that point to move it. While you press the mouse button,
a tooltip
shows the length of the wall.
The walls modified with the mouse are drawn simultaneously in the plan and in the 3D view.
A wall may also be edited thanks to its pane, by double-clicking on that wall in the home plan, or by choosing Plan > Modify
walls... after
selecting it.

In the wall pane, you may change the coordinates of its start
and end points, the colors, the textures and the shininess of its left
and right sides, the pattern used to fill it in the plan, the color used to paint its top in the 3D view, its thickness,
its height and its arc extent if it's a round wall. You may also add (or remove) baseboards at the bottom of each side by clicking
on Modify baseboard buttons.
If it's a sloping wall of a garret, choose different heights at its start and end points, and ensure
yourself that the Sloping wall radio button is selected.
Use the wall start and wall end indicators drawn in the plan on each selected wall to distinguish its left side
from its right side.
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