@chriscurwen When you have an open position, you’ll need to click on it & then you’ll see the trailing stop option. When you toggle it, you’ll notice that the distance is set in points / nominal value, rather than percentages.
If you were to calculate the default distance when toggling it, you’d see that it’s always around 10%. If you wish to increase the distance, you’d need to calculate how much points X% is. With Corning trading at around $20.5, a 30% trailing stop would mean a point distance of approx. $6.15.