Insert Section - doesn't over ride page...

I want to have different numbers of columns in different parts of my document. I’ve read that the best and/or only option is to insert a new section and then that section will over ride the page its in. But it doesn’t work for me. I’ll be on a page that is split into two columns, and insert a new section that I specify to only have one column, and it keeps this new “one column” section inside the one column of the two on my page. In other words, section doesn’t seem to overide the page. What am I doing wrong? I’m running version 4.4.4.3 on Win 7.

In the case of columns it is necessary to first exit a section (refer answer here prior to defining a new one.