How to create full-width landing page image/slider

I’ve tried a few different Cryout Creations themes now and am having the hardest time getting a slider image/static image to appear on the landing page—for Fluida, specifically. I see that the theme uses the Front Page page for the landing page, but when I add an image to that page it just shows up on the landing page as though it’s a regular page.

I don’t see any documentation that explains how to get the slider to look like the marketing images used for the theme. I’m looking for one image, not even a slider, that goes the full width of the home page and doesn’t have a title affixed to it. Can someone point me in the right direction?

Here’s what my landing page looks like: https://imgur.com/OOdjkDQ
But here’s what I’m going for as far as an image: https://imgur.com/nmEehNt