Rescan spent can only be used with a trusted remote node. If you trust the current node you are connected to (%1), you can mark it as trusted in Settings > Node page.
Use this feature if a transaction is missing in your wallet history. This will expose the transaction ID to the remote node, which can harm your privacy.
Wallet is view-only and sends are only possible by using offline transaction signing. Unless key images are imported, the balance reflects only incoming but not outgoing transactions.