slider crops images on mobile devices

Hi,
I need help with the slider, don’t know if I have the page set properly. On mobile devices the images get cropped and I notice too much white space under the slider too but on a laptop there is not white space.
I noticed that Fortuna has under column settings, “responsive options”. do you have any instructions on how to use this section? I have no idea how to adjust settings.
Let me know if you want access to the site.
Nancy