Apply it to a selection, not just the whole document
Selecting a block of text before opening Columns splits only that selection into columns, using automatic section breaks around it, rather than converting the entire document β useful when only one part of a page, like a sidebar or a list, needs a multi-column layout.
Typical use case
Newsletters, flyers, and academic papers formatted for two-column printing are the most common reasons to use this feature, since it lets text reflow automatically instead of manually placing separate text boxes side by side.
Frequently Asked Questions
Can each column have a different width?
Yes β in the More Columns dialog, uncheck "Equal column width" and then set a custom width and spacing for each column individually.
Why did my whole document turn into columns when I only wanted one section?
If no text was selected before applying columns, Word applies the setting to the whole document, or the whole section the cursor is in. Select the specific text first, or add section breaks manually, to limit the effect.