Using the Expand/Outline Button
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You can display the filenames or the expanded contents of the selected files. When you choose the Expand button, the contents of the files are expanded and the button label then changes to Outline. When you choose the Outline button, only the filenames are displayed. Files with the same name but different contents are displayed in red text. Identical files are displayed in black text.
To display the expanded contents of the files
Select the files you want to compare.
From the Expand menu, choose Both Files.
From the View menu, choose Expand.
– or –
Choose the Expand button.