I'm not sure what you mean by the southeast triangle, but if you click the ¶ symbol on the home tab you will see the formatting marks such as paragraph symbols and page breaks. The page breaks have the words "Page Break", although in some cases you won't be able to read it due to graphics covering it and other considerations. However, usually you will see a horizontal dotted line that helps reveal page and section breaks even if you can't see the words.

Anyhow, glad to hear you got it sorted out.