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Step 1. Check the box beside the task to mark it complete.

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Step 2. Open Completed to review finished tasks and their checked boxes.

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Step 3. Uncheck the task to reopen it. It leaves the Completed view.

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Step 4. Select Undo within 12 seconds to restore the previous completion status.

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Step 3. Reopened tasks keep their details and can be found in All tasks or their named list.