Portfolio Total Return includes the capital variance (gain or loss at current price) + fees (buying and estimated selling rate if you were to sell now) + interest/dividends received (as of now)
Realised Profit/Loss: the net gain or loss you have made from investments which have been sold. This calculation will consider the amount paid to purchase the original investment compared with the price you sold it for. To note that any dividends received during the holding period are excluded from this calculation.
Total Overall Return refers to the total of capital variance (incl fees + interest/dividend received) + net gain/loss made from investments which have been sold.
In other words, Portfolio Total Return + Realised Profit and Loss = Total Overall Return