Number of project columns

Change to 4 columns:

 @media only screen and (min-width: 991px) {
     .roll-project.fullwidth .project-item {
        width: 25%
     }
 }

Change to 3 columns:

 @media only screen and (min-width: 991px) {
     .roll-project.fullwidth .project-item {
        width: 33.333333%
     }
 }

Tip: After you change the no. of columns you should also change the image size for the portfolio widgets. You can use this plugin to change them and you’re looking for the sydney-mas-thumb image size.