The trailing stop has two parameters: Trigger P/L and Trailing Stop.
The first parameter determines the level after which your trailing stop becomes active. The second parameter is the actual trailing stop.
To activate the trailing stop, the price must first reach the Trigger P/L %, meaning the price must move in the direction of your trade by the percentage you entered in the Trigger P/L field.
Once the Trigger P/L is reached, it becomes the starting point for your trailing stop. If the price continues to increase, the trailing stop will move in the same direction, maintaining a fixed distance (based on the percentage you entered in the Trailing Stop parameter).
If the price drops after reaching the Trigger P/L, the stop becomes active and remains at a fixed distance from the Trailing Stop (based on the trailing stop percentage entered). If the Trigger P/L is not reached, your strategy will not have a stop level.