As far as I know they only have fixed leverage. Of course you can still ask broker this question by sending a message. I am sure they will give detailed answer to this question.

By the way, they have different leverage sizes for different asset groups. Perhaps that is why you have such question.

I think it is fixed but it is adjusted based on the asset you are trying to trade. Even in the same asset class, some assets have up to 1:400 leverage but some assets can only be levered up to 5 times. So, it's sort of dynamic in that sense :D