I am currently trying to use WP Recipe Maker on my site. The post isn’t fullwidth like I would like it.
Hi There,
Thank you for the screenshot. Please do share your post URL so we can check your setup. On a sitewide settings, you can go to X > Launch > Theme Options > Layout and Design to check site width settings. 
I checked my site wide settings and it is in fullwidth
Hi There,
Please add the following code to Theme Options CSS
.recipe .entry-title , .recipe .p-meta {
display: none;
}
html body .recipe .wpurp-container {
border: 0px !important;
}
Hope it helps
Hi There,
I am glad it worked, please add the following code to Theme Options CSS
.entry-wrap {
background: none;
}
Hope it helps