Hi! Thanks so much for responding on this. Here are the two pictures I have. The first is the image that I'm planning to chroma key and put in the foreground, the second is the background.
To fix the weird cropping on the character right click on the pan crop grid and select match source. This is something that will can happen if you are trying to position or animate media that has a different frame size than the project.
Got it! and that's all it'll take to stop the crop? i can still change the size of the character, etc. so that it's small and at the top of the screen?
Thats all it takes. If you find you ever need to make the image smaller than pan crop will allow you can use track motion or the picture in picture effect.