simple-slider in the page content.
You can change slider or set ads / display newsletter form if you want.
In this case, it's using the slider with key
home-slider. You can find it in Admin -> Simple Sliders.
You can modify Home Slider 1 or change the key of shortcode to use other sliders.
If you want to make slider full width, just deselect ad:
Then it will be full width