I would group all your items temporarily (to make sure they stay positioned relative to each other), then modify the document settings to be square, then center the grouped items on the square page vertically and horizontally.

On Wed, Nov 13, 2013 at 11:09 AM, Terry Brown <terry_n_brown@...12...> wrote:
On Wed, 13 Nov 2013 13:02:53 -0600
Ian Pilcher <arequipeno@...2279....> wrote:

> I feel like I must be missing something *really* obvious, but I can't
> figure out how to do this.  I have a rectangular document that I need to
> make square, while keeping the contents centered.  I.e., I need to add
> equal amounts to the left and right side of the document.

Make the page whatever size you want, select all, and center relative
to page?


Change Relative to: to Page and click 'treat selection as group'.

Cheers -Terry

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