Hello Rich,
Great questions. The hero image is set to always “cover” the top of the site. That’s also set to be full screen, so you’ll have an image at the top that is always the full height and width of the browser window.
There is an uploader at the very bottom of the hero area options where you can upload an image that will appear on smaller browser windows. You can use it to add an image that will appear when the browser window is smaller than 768 pixels wide.
If you need to have something like a logo, I would suggest separating it from the background and using the Hero Logo uploader to upload a separate image for it. That spot will scale down as the browser window shrinks and won’t be cropped. That’s the best way to handle logos.
There will always be some cropping of the background image. The amount depends on the difference in aspect ration between the image and the browser window. The more similar they are, the less cropping. The greater the difference, the more cropping there will be since it has to cover the area.
If you have any questions, let me know.
Thanks,
Bill