When you first open Visual Difference, a button displays beside the first line of any blocks of text that are unchanged, and a line runs from the button to the end of the unchanged block. Text that displays above and below hidden text for context is not included in the marked block.

To collapse the block, click .

A button displays beside each collapsed block. The line number of the first line in the collapsed block displays beside the button, along with the number of lines in the collapsed block. Depending on your preferences, a specific number of lines are displayed above and below the collapsed block in order to provide context for the collapsed text.

You can click the to expand the block and view the text.

If you have a line selected in an expanded or collapsed block, you can also collapse or expand the block of text using the View menu or by right-clicking and selecting an option from the shortcut menu. To expand a specific block, you can select either the line or one of the context lines around it, or double-click the line.