Yes remove the code under – @media only screen and (max-width: 1800px) since this is removed in the new version (coming soon). You can check out the demo to see that the images show up in full width now.
After you do that, look on line 1504 and make sure the code looks like this –
.front-page-1,
.front-page-4,
.front-page-5,
.front-page-7,
.front-page-9,
.front-page-12 {
/*background-attachment: fixed;*/
background-position: 50% 0;
background-repeat: no-repeat;
-webkit-background-size: cover;
-moz-background-size: cover;
background-size: cover;
}
I am still doing tests to get it to be full width AND work on mobile devices, so there may be some minor changes added later.