There is no seamless, easy, reliable way to do this. This is a reasonably
frequent request that's been sent to the dev team by me personally many
times. I remain hopeful.
In the meantime, Randall is correct. Try de-select All, Edit>Copy Drawing,
Edit>Paste onto new page in new document. Don't forget your background
pages.
Sorry this is such a pain. I wish I had a better answer.