Final answer:
When subtasks are hidden in a view, reports containing task lists feature only 'summary' tasks to provide an overview without detailed subtask information.
Step-by-step explanation:
If subtasks are hidden in a view, reports that contain task lists will include only summary tasks. Summary tasks are broader tasks that are composed of smaller subtasks. When details are hidden, generally only the higher-level summary information is displayed. This allows report viewers to see an overview of the project tasks without being overwhelmed by every detailed subtask. For those working with project management software, understanding which tasks appear on reports when subtasks are hidden helps maintain clarity in project communication and documentation.