Flatten All only applies to the selected instrument in the active Copilink tab.

May not work when:
- NinjaTrader hasn't updated open positions
- Wrong Copilink tab is active
- Communication failure between NinjaTrader and broker

Manual flatten from NinjaTrader:
Right-click in Positions tab → Flatten Everything

VERY IMPORTANT: Disable follower copying in Copilink first, or "Flatten Everything" may open reverse trades!

Safe process:
1. Disable all followers in Copilink
2. Flatten in NinjaTrader
3. Re-enable followers