Cindy's Answer
I would treat this as what we call 'reactivity'. Working on this should not interfere with your IGP training at all if done properly.
It's quite common in GSDs and many of the herding breeds, when they are leashed or behind a barrier (window,car,fence)
We have a really good course by Tyler Muto called Leash Reactivity that will teach you how to work on it which I have linked below, it covers the leash barking.
For the car and home issues, I don't allow dogs with this tendency to look out of the car windows. I would use a sheet or blanket to cover their crate in the vehicle and at home use baby gates or close blinds so they can't practice looking out the windows and barking.
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