Hello @PANCRAZIO,
The portfolio item page layout in Ethos is designed to have a 70/30 column layout which displays the portfolio featured image on the left and some info on the right side. If you want this layout to be fullwidth, please add the following CSS code in the X > Theme Options > Global CSS (http://prntscr.com/evui3r)
.single-x-portfolio .entry-featured,
.single-x-portfolio .entry-wrap {
width: 100%;
float: none;
}
Please let us know if this works out for you.