Hi. I have the slider set in a container that is approx 80% of the page width.
Now I want the slider to span the entire page.
I'm not sure how I do this, and if I do this with CSS for the slider, in the Storefront theme editor or in the WordPress page editor.
Welcome to our forum.
Slider container width should automatically set to 100% and its depend on wrapper container width. try to change wrapper width it will follow the wrapper width.