Slider Not Full Size

I have Shop Theme Responsive 8.1 template. The Full Size Slider is not showing my sliders at full 100% size. I used the provided Photoshop banner template, which is 940 width by 380 height, and kept the files at this size. I uploaded these banner images to the media folder and left them at their full size. It does not seem to make a difference if I change the template width to 100% or fixed 1170px in the Page Setup/General Layout section. For reference, my website is https://poweradventuresmt.com/

I don’t know HTML code or how to work with CSS, so I’m hoping this is an easy fix. For clarification, I am using the “Full Image Slider” not the “New Plugin Slider.”

Thank you.