
Ari W. answered 06/18/19
Published Artist Teaching Graphic Design & Photography
Open the Align panel; from the Window menu select Align. In the lower right corner of the panel there should be a control for Align To (if not, choose Show Options from the flyout menu in the upper right corner). From the Align To control choose Artboard. Any object you now select and choose to Horizontally or Vertically Align Center will center on the artboard.