Your total return has two components:
The monthly payouts paid to your cash account.
The change in your current investment value: your portfolio's market value rises or falls with markets (capital appreciation or depreciation).
In short, total return = income paid + change in current investment value.
Notes: This is why a positive payout yield does not mean a positive total return. If your investment value falls by more than the income you received, you can still be at a loss for the period, even though you were paid every month. The product page shows the payout yield and the total return separately, so you can see both.