The Task window lets you pause, resume, and cancel tasks.
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Drag the appropriate task from the Active Tasks pane to the Paused Tasks pane.
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Choose Pause All from the Task window menu.
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Drag a task from the Paused Tasks pane to the Active Tasks pane. The task returns to its previous position in the queue.
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Select Resume All from the Task window menu. All tasks in the Paused Tasks pane (except failed tasks) are moved to the Active Tasks pane.2 Press Command+A (Mac) Control+A (Windows) to select all the tasks in that pane.Some tasks involve one or more sub-tasks. Deleting a task cannot undo sub-tasks already completed. For example, if importing and converting multiple files appears as a single task, deleting that task before it is completed stops the import and conversion process, but files already converted and imported remain on disk. If you want to cancel a task involving multiple sub-tasks, you can instead let the process complete and then use Undo to completely undo all sub-tasks, as available.