Cześć Marek,

Using hammer? No. Using Duck Tape? Also No. Using custom CSS? Yes by now, until it will not be fixed in SPPB code.

@media screen and (max-width: 767px) {
  .sppb-col-xs-4 {
    -ms-flex: 0 0 100%;
    flex: 0 0 100%;
    max-width: 100%;}
}