web/web_advanced_search/static/src/css/web_advanced_search_x2x.less

.o_search_options {

  .o_filters_menu {
    .o_filter_condition {
      max-width: inherit;

      .o_searchview_extended_prop_value {
        .ui-autocomplete-input {
          .form-control();
        }

        .oe_m2o_drop_down_button {
          top: 6px;
          right: 2px;
        }

        .o_form_field_domain {
          min-width: 400px;
        }
      }
    }
  }
}

.x2x_container {
  min-width: 60ex;
}