Scale game vertically only

I am making a 2d portrait game where the width of the screen makes a big difference. Ideally, I'd be able to lock width the main camera and the height would be changed based on device (the iPhone X, for example, would get a lot more content than an IPad beacuse it's taller). Is there a way to do this? Currently, my game scales both height and width and really messes somthings up.