discourse/app/assets/stylesheets/mobile/groups.scss

.groups-page {
  h1 {
    margin-top: 20px;
  }

  .groups-header-filters {
    display: block;
    float: none;
  }

  .groups-header-filters-name,
  .groups-header-filters-type, 
  .groups-header-new {
    margin-top: 10px;
  }
}