Hello martincastro,
the theme is responsive, so the number of rows change, depending on the actual screen-size. Just resize your browser-window to see the effect. If you want to change them anyway, you can do this by adding some css, i.e. inside the customizer->additional css:
@media (min-width: 34em) {
.card-columns {
-webkit-column-count: 2 !important;
-moz-column-count: 2 !important;
column-count: 2 !important;
}
}
@media (min-width: 48em) {
.card-columns {
-webkit-column-count: 3 !important;
-moz-column-count: 3 !important;
column-count:3 !important;
}
}
@media (min-width: 62em) {
.card-columns {
-webkit-column-count: 4 !important;
-moz-column-count: 4 !important;
column-count:4 !important;
}
}
@media (min-width: 75em) {
.card-columns {
-webkit-column-count: 5 !important;
-moz-column-count: 5 !important;
column-count: 5 !important;
}
}
You can fiddle around with the min-width options, the number of breakpoints and the column-count-option to fit your needs.
Hope that helps ??