What is the Reduce-Only option for?
In one-way mode, conditional orders such as take-profit and stop-loss orders can also be set to Reduce-Only. If the position has already been closed when the order is triggered, it won't open a new position in the opposite direction.
If a Reduce-Only order's quantity exceeds the existing position, the excess won't open a position in the opposite direction. The order will be reduced or canceled according to the rules.
The most important thing to remember when managing positions: in one-way mode, it's best to enable Reduce-Only for closing orders and conditional orders.
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Just a note, not trading advice.