Flatten All in Copilink applies only to the selected instrument in the active window. It may not function when: - NinjaTrader hasn't updated the open position. - The wrong Copilink tab is active. - Communication failure between NinjaTrader and the broker. You can flatten from NinjaTrader manually: Right-click in Positions tab → Flatten Everything. (Improtant: close copilink or disable followers before doing this!) Caution: Flatten Everything can open reverse trades. Temporarily disable follower copying first.