Following code now in master CSS sets column 6 wide on pc and 3 wide on phone although in visual builder the default 4 width continues to show

@media (min-width: 768px) {
.et_pb_column_4_4 .et_pb_portfolio_grid .project { margin:1.333335%!important; width: 14%!important; clear: none!important; }
}

@media only screen and (max-width: 767px) {
.et_pb_column_4_4 .et_pb_portfolio_grid .project {
margin: 2.666665% !important;
width: 28%!important;
clear: none!important;
}
}