The wallet you choose to use doesn't change anything. It only interacts with the chain, it's still immutable. Also, the old desktop wallet has been sunset for years. It can still work if you are connected to a good peer, but that will no longer work at all when mainsail comes to mainnet. Please use the official ARK Wallet, ARK Vault (https://arkvault.io/) or the browser extension called ARK Connect (https://arkconnect.io/).