1. In the Imposition Plans pane of the Signatures view, select the pages that you want to center.
2. From the Edit menu, select Center Page.
3. To see the results of the change, ensure that the Center Page, Offset, and Trim Size columns are visible in the Imposition Plans pane of the Signatures view.

For pages that were centered:

• The Center Page column now displays Centered.
• The Offset column in the Imposition Plans pane of the Signatures view now displays the centered offset, which is the difference between the PDF page's media box and the imposition trim box.

For pages that were not centered:

• The Center Page column now displays Not Centered.
• The Offset column in the Imposition Plans pane is the same as the offset in the Pages pane of the Signatures view, which is the difference between the PDF page's media box and the page trim box.