How do I make Preview default to showing the Thumbnail sidebar?

I use Preview for documents. When I receive an email with .pdf which has been scanned on a photocopier, I want to open it with the thumbnail view showing, so I get an overview of the document.
Recent version/s of Preview open only in simple page view, forcing me to manually open thumbnail view.
Perhaps I am overlooking something, but how can I make Preview automatically show documents with thumbnails?

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