The PDF layout shows the cursor control device as a small trackpad to the right of the keyboard. Why? Because the captain (left seat) can reach it with their right hand without removing their left hand from the sidestick. First officer uses their left hand. This ambidextrous design is invisible in photos but jumps out in a dimensioned PDF.
Located on the center pedestal, these allow pilots to interact with the multifunction displays similar to using a computer mouse. Quick overview Boeing 787 cockpit✈️ - Facebook boeing 787 cockpit layout pdf