Aligning objects with the T-squaresUse the T-squares — movable horizontal and vertical guide lines — to help you align objects in Layout mode. An object's left or right boundary, top or bottom boundary, or center “snaps” to the T-square lines as you drag the object.
Using the Selection tool , move either the horizontal or vertical T-square line. Override the T-squares' snap-to effect Press Alt (Windows) or Command (Mac OS) as you drag an object.