#bc_horizontal_sidebar ul.wp-block-categories-list {
  display: none;
}

#bc_horizontal_sidebar .bc-mobile-categories-wrapper {
  display: block;
}

@media only screen and (min-width: 575px) {
  #bc_horizontal_sidebar .bc-mobile-categories-wrapper {
    display: none;
  }

  #bc_horizontal_sidebar ul.wp-block-categories-list {
    display: flex;
  }
}