In the new New Document setup dialog it is possible to set margins larger than the page dimensions which results in Margins outside the page area. This does not happen with the legacy dialog.

Please see https://community.adobe.com/t5/indesign-discussions/bug-issue-with-margins-and-paper-size-document-with-margins-outside-document/m-p/13425416#M507464 for more details.

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