lower pane

"As part of a combination view, the object (task / resource) in the upper pane selects the detailed information that is displayed in the lower pane beneath. For example, with a Gantt chart view in the upper pane and the task form view in the lower, when a task in the Gantt chart is selected, the task form view displays detailed information about just the selected task.'

SOURCE; microsoft project glossary-projectlearning.net"