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Disable the Fixed group header in DropDownList in Vue DropDownList component

The following example demonstrate about how to disable the Fixed group header in DropDownList through CSS by using visibility attribute.

Source
Preview
app.vue
<template>
  <div id="app">
    <div id='container' style="margin:20px auto 0; width:250px;">
        <br>
        <ejs-dropdownlist id='dropdownlist' popupHeight='200px' placeholder='Select a vegetable' :fields='fields' :dataSource='dataSource'></ejs-dropdownlist>
    </div>
  </div>
</template>
<script>
import Vue from 'vue';
import { DropDownListPlugin } from "@syncfusion/ej2-vue-dropdowns";
Vue.use(DropDownListPlugin);
export default {
  data () {
      var vegetableData =  [
        { Vegetable: 'Cabbage', Category: 'Leafy and Salad', Id: 'item1' },
        { Vegetable: 'Spinach', Category: 'Leafy and Salad', Id: 'item2' },
        { Vegetable: 'Wheat grass', Category: 'Leafy and Salad', Id: 'item3' },
        { Vegetable: 'Yarrow', Category: 'Leafy and Salad', Id: 'item4' },
        { Vegetable: 'Pumpkins', Category: 'Leafy and Salad', Id: 'item5' },
        { Vegetable: 'Chickpea', Category: 'Beans', Id: 'item6' },
        { Vegetable: 'Green bean', Category: 'Beans', Id: 'item7' },
        { Vegetable: 'Horse gram', Category: 'Beans', Id: 'item8' },
        { Vegetable: 'Garlic', Category: 'Bulb and Stem', Id: 'item9' },
        { Vegetable: 'Nopal', Category: 'Bulb and Stem', Id: 'item10' },
        { Vegetable: 'Onion', Category: 'Bulb and Stem', Id: 'item11' }
        ];
    return {
        dataSource : vegetableData,
        fields : { groupBy: 'Category', text: 'Vegetable', value: 'Id' }
    }
  }
}

</script>
<style>
@import "../../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-inputs/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-dropdowns/styles/material.css";
.e-ddl .e-dropdownbase .e-fixed-head {
  visibility: hidden;
}
</style>