You can rotate a wall/construction line group using either of the following methods:
With the rotation handles
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To rotate the entire group, make sure the Link mode is enabled.
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Click once to display the wall handles, then click again to display the rotation handles.
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Press and hold the mouse button on the first rotation handle (clockwise) of the group (if you select any other rotation handle, you will be rotating only the walls following the selected rotation handle) while rotating the group to the required angle.
With the Rotate command
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Point to any wall of the group and right-click. In the pop-up menu, point to Wall Group and select Rotate.
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Turn the group to the required angle, then click to confirm. The base point for rotating the group is the first rotation handle of the first wall (clockwise).