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decksnap

macrumors 68040
Apr 11, 2003
3,075
84
If you have snapping on, objects should snap to a guide you have placed at exactly the middle of the document.
 

iMeowbot

macrumors G3
Aug 30, 2003
8,634
0
Option-click the eye to make the text layer the only visible one, then click on its thumb to select the layer. Edit->Select All. Choose the Move tool from the palette, click the Align Vertical Centers button followed by Align Horizontal Centers.

(the hiding isn't strictly needed, but helps to make sure you're really selecting what you think you're selecting.)
 
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