You can see realized profit and loss by exchange if you click "By Exchange".
Please note that book values used in this screen are calculated by all trades across all exchanges, as in the ledger screen. When you made a trade which realizes profit and loss, the P&L will be summarized per exchange in this screen.
* "Total Revenue" and "Total Cost" columns are available only for taxpro edition. When "Periodic Average Cost(総平均法)" is selected as a cost basis method, those two columns will be calculated.