Windows – Why does the whole document change page orientation instead of just a single page

microsoft wordmicrosoft-word-2007windows 7

I want to make just one page in my document change from portrait to landscape orientation. I have followed the instructions for How can I make just one page of a Word document horizontal?

However, the whole document changes to landscape orientation! How can I prevent this? I'm using Word 2007 on Windows 7.

If you show formatting marks, you should see two of ::::::Section Break(New Page)::::::