Once you update the Status of a Work item to Completed, it will move off your Work board and onto your Completed board.

You can easily access all your Completed items on the Completed board.

There are two ways to access the Completed board.

a. Click the Completed button or Check icon on the header.
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b. Use the Reporting Period drop-down and select Completed Date.

In both cases, Filters will show Completed. This automatically shows you all your tasks with the Completed status on your Work list.