Scott HelmersConnect With a MentorVisio Consultant, Trainer, Author, and DeveloperCommented:
Those arrows are new in Visio 2013 and are actually pretty cool... as you drag either or both dimensions of a shape, the double-headed arrows appear when there is at least one other shape on the page whose length/width match those of the shape you are resizing. Consequently, if your goal is to resize an existing shape so that it matches another shape in either or both dimensions, you get immediate visual feedback when the dimension(s) match.
BTW, the arrows also light up on the existing shape(s) whose dimensions match the one you're changing.
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BTW, the arrows also light up on the existing shape(s) whose dimensions match the one you're changing.