The bottom row of the Alignment Buttons are the Vertical Alignment Buttons,which align the selection of openings Vertically within their Bounding Rectangle.
These buttons activate when two or more objects are selected.
The Bounding Rectangle is shown for illustration.
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Bounding Rectangle Definition
The Bounding Rectangle is a dotted or invisible rectangle that encompasses the outermost boundaries of the selectedobject(s) in Designer and Trace, and includes Control Points which can be used to edit the object.