When you use pool staking to stake your DOT, you need to manually claim your staking rewards. You should take note of the amount that you are claiming versus the transaction fees that it costs to execute the claiming operation.
To claim pool staking rewards you should:
Open the Nova Wallet application.
Select the Staking screen.
Select your staking position, in this case, would be Polkadot DOT.
From the Polkadot pool staking screen selectClaimrewards.
Ensure that you are happy with the choice to either restake your rewards (compounding) or not. If you do not wish you restake your rewards, ensure that the toggle is in the off position and your rewards will be added to your transferable (unlocked) balance.
Review the contextual information including any associated fees and selectConfirm.