Provided you haven't used the addresses generated by the extended public key before, you should be able to ask your wallet to generate a new public address, and that new address should match the next address Swan will withdraw to.
If you have already used some of the addresses in your wallet, ideally, you would start a new subaccount within your wallet and dedicate that sub-account exclusively to Swan Bitcoin withdrawals. However, if you don't want to generate a new subaccount and you are aware of your address reuse, then you can simply go back in your transaction history to review your previously used addresses and confirm the next withdrawal is to an address that you own.