Working With Views and Feeds → Using Backlog Views → Viewing Backlog History
In a backlog view, click the History button to view a list of items that have been added or removed from the backlog since the start date. For example, if you have a sprint in which you decide you can complete 10 items, but mid-way through the sprint you realize you cannot complete them all and you pull some items out, you can track which items were deferred by viewing the backlog history.
In the History of Changes dialog box, you can:

), and then select the check box
that appears next to each item that you want to mass update. When you have
selected all the items you want to change, click the
Update button, and then complete the mass
transition steps.
Note that you can resize the columns in the History of Changes dialog box as necessary. To revert size changes, select Reset Backlog List Layout from the Actions drop-down list.
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