atomic swaps are available on Bisq1 only for BSQ trades, while XMR trades follow the normal multisig trading protocol based on the security deposit: both traders lock the deposit, seller also locks the BTC trade amount, the BTC buyer sends XMR, and when that is confirmed, either manually, or for instant trades, automatically via federated XMR explorer nodes, the BTC is released to the buyer, and the deposits to their respective owners.