Text in newsletter-style columns flows from one column to the next on the same page.
An entire document
On the Edit menu, click Select All.
Part of the document
Select the text.
Existing sections
Click in a section (section: A portion of a document in which you set certain page formatting options. You create a new section when you want to change such properties as line numbering, number of columns, or headers and footers.) or select multiple sections.