The Lockout control on the account widget blocks new trades for a period you choose — a deliberate manual action, separate from a firm-imposed lock or an automatic loss-limit lock.
Choose Sessions to unlock when a trading desk session closes (New York, London, Tokyo, Sydney), or Custom for a fixed duration (15m, 30m, 1h, or all day). Add an optional note for the audit log, then confirm — this step is deliberately hard to reverse, so read it before selecting it.
A lockout only blocks new exposure: closing, reversing, cancelling, and flattening stay available the whole time, so you can never be trapped in a position.