You can arrange the items displayed in Client reports in the order you desire using the Arrange Items functionality. The Arrange Items functionality provides two arrangement options: Alphabetical Order and Specific Order. With Specific Order, you can move items up, down, or to a specific row.
To arrange the items in a Client report in the desired order, click Reports in the ribbon and then click Arrange Items.
You will see the Arrange Project Items modal with the options to arrange the items.
The Arrange Items functionality available here is also available under the Layouts tab in Project Editor. When you use the functionality from the Layouts tab, the item arrangement is automatically saved for Client reports.
Check out this article for more details.