Unable to widen page

[gwpriester]

I think Acorn is referring to the Lock Page & Lock Background in the Page and Layer Gallery.

When you hover over the outline on the right side of the page, does the cursor change to a double arrow? If so, you can drag the right margin in or out.

And in the Page Options > Page Size you can select Custom for the Page Size and manually change the width.

Any of these suggestions help?