Final answer:
The Most Useful item in the Knowledge Management Service Portal displays articles with the highest percentage of users marking them helpful, allowing users to identify the most valuable content based on peer evaluations.
Step-by-step explanation:
The item in the Knowledge Management Service Portal that displays articles with the highest percentage of users marking them as helpful is known as the Most Useful item.
This feature helps users quickly identify the most valuable content based on peer evaluations.
Users can leverage this tool to find the high-quality information that has been deemed beneficial by others within the organization, ensuring that they access the most reliable and helpful articles for their needs.