If you add the 'Select Drawing Objects' icon to Word's Quick Access Toolbar, then click on that, you will be able to select the shape (which is currently formatted as 'behind text' and anchored to your document's last paragraph) and delete it. Alternatively, you could temporarily insert a page break before the last paragraph, then some more paragraph breaks (so the drawing comes back into view), then delete the shape.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]