Boxed layout - Footer outside full width

Navigate to YOOtheme > SETTINGS > Custom Code > CSS/LESS, and add the following to it:

@media (min-width: @theme-page-container-width) {
    .tm-page-container .tm-page {
    max-width: none;
    background: @theme-page-container-background;
    }
}
@media (min-width: @theme-page-container-width) {
    .tm-page-container .tm-page > main,
    .tm-page-container .tm-page > header {
    max-width: @theme-page-container-width;
    margin-left: auto;
    margin-right: auto;
    }
}