To draw a "corner window"; the walls are drawn are drawn with the command "Curve wall" and the count of curved wall chord is given "1" in the advanced settings of the wall.
If you check the bent door/window option is selected in the door window settings; the windows take the shape of your the wall and settle themin, if the straight door/window option is checked, it will settle by beveling your the corner wall is bevelled.
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