If you want to make it full width then the height will be static and width will be responsive. And in such situations image will be almost always cropped. It is physically impossible to keep the width different and height always static and at the same time not crop the image. Hope that you understand the point. If you want to not crop the image, you need to disable the full width option or use our banners carousel since it has no static height and images will not be cropped.
Our main home page demo slider created with a Revolution slider. And it doesn’t have any full-width images. It has a full-width background with a solid color and images are just additional layers over the background. We suggest you to import our dummy content somewhere on the test site and check how this slider is created.