About Flipping the Angle of Flat Walls
You can use the command adjacent to the angle box when creating or redefining a flat wall to flip the wall orientation along the attachment edge. To make the command available on the Flat tab and shortcut menu, set the smt_allow_flip_sketch configuration option to yes.
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When you flip the angle of a sketch, the wall is mirrored about a plane to keep the symmetry.
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