When you place the Door/Window you cannot place it outside the Wall body horizontally. That is a constraint. However, vertically you can place it wherever you want. So it is best to check it in 3D after placement.
Also, once a Door/Window is placed, you can move it in the Wall and you can move it outside the Wall horizontally as well as vertically.
So you just have to be aware of what you are doing and not do such a thing.
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