Click on it, and Word will display all formatting marks, including section breaks. If you want to take a better look at where your section breaks are, you need to enable the option to show formatting marks.
That way, the landscape orientation only applies to this page and not the whole document. You will now see that the second page of your document has the landscape orientation, while everything else is portrait.
Click the beginning of the third page and follow the same procedure to insert another section break.
