I cannot find anywhere in the settings where to adjust the beeping threshold.
Now the senors go wild when I am 4 feet away from the obstacle. I would like to reduce that.

 

From what I can tell is you have the option to turn the sensors on/off. There isn't a way to adjust the sensitivity. The front driver's side sensor goes off when I'm in a drive up window. I just have to turn it off until I'm done.