Straighten a span segment
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Select the span segment between grid B2 and C2 (the highlighted span segment in the previous figure).
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Turn on Snap to Intersection ().
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Select the Rotate tool ().
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Click at the end of the span segment at grid B2.
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Click at the end of the span segment at the wall.
The command line prompts Enter rotation end angle.
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Enter 90 and press <Enter>.
The selected span segment is now vertical.