Change Footer Columns

Number of columns (widget) in footer is constant (4).
Add this rule into Dashboard – Theme Options – General – Custom CSS:

@media screen and (min-width: 760px) {
.footer .widget {
width: 33.3% !important;
}
}

number of columns will be set to 3.

Set 50% for 2 columns, 100% for 1 column.

3