The Effort section of a detail pane comes under several names depending on the context and has some variance in appearance and content. It can be found in these detail sheets:
The Effort section shows the breakdown of effort by activity and team. For Phase Effort and Product Effort the tables represent the sum of effort from activities directly associated with the phase or product (in some cases no activities are associated, in which case all values are zero)
Total Effort tables are used for phases and products and show summed values for all activities from the phase or product and all sub-objects.
Activity Detail Pane, Effort section tables. Others similar but content varies slightly
The columns in each table are adjustable to improve readability.