How to increase my alarm sensitivity on 01 ford explorer sport XLT?

I have an 01 ford explorer sport XLT and I suspect people are messing with it at night and jumping on the hood for a seat and the alarm isn't going off. I want to know how to increase the sensitivity on it to make the stop doing it because of dents they make. Anyone know where the alarm is and how to turn up the sensitivity?

On some vehicles the factory installed alarms are only triggered by opening doors or breaking windows. You might want an aftermarket alarm system or a motion sensor light where you park.