Hi Ed,

You can't disable this feature, but you can use a work around

When you draw 2 or more walls and you join them using the mouse, you will notice that they will "glue", and instead of two or three walls you will have a set of walls, with the same properties (thickness included)

However, if you join them using the arrows (keyboard) the walls will be together, but they will not fuse, therefore they will not share their properties

Hope this helps

Patricia