The ... (more actions) menu includes a View Source option. Users expect this to provide an editable view of the storage format of a page, but instead it provides a view of the page, as it would appear in the editor.

We had planned to remove this screen in Confluence 7.0, but we've heard your feedback, and will not make any changes at this time.

This feature is not to be confused with the Atlassian Labs Source Editor plugin, which does allow you to edit the storage format of a page.