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Dropdown arrow can be customized on popup open and close. It can be handled in beforeOpen and beforeClose event.

In the following example, the up arrow is updated on popup close and down arrow is updated on popup open using beforeOpen and beforeClose event by adding and removing e-caret-up class.

Source
Preview
app.vue
<template>
<ejs-dropdownbutton id="ddBtn" :items='items' :beforeOpen='onBeforeOpen' :beforeClose='onBeforeClose'>Clipboard</ejs-dropdownbutton>
</template>

<script>
import Vue from 'vue';
import { BeforeOpenCloseMenuEventArgs } from '@syncfusion/ej2-splitbuttons';
import { DropDownButtonPlugin } from "@syncfusion/ej2-vue-splitbuttons";
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);
Vue.use(DropDownButtonPlugin);

export default {
    data () {
        return {
            items:[
            {
                text: 'Cut'
            },
            {
                text: 'Copy'
            },
            {
                text: 'Paste'
            }]
        };
    },
    methods: {
        // Removing 'e-caret-up' class.
        onBeforeClose: (args: BeforeOpenCloseMenuEventArgs) => {
           document.getElementById('ddBtn').ej2_instances[0].cssClass = '';
        }
        // Adding 'e-caret-up' class.
        onBeforeOpen: (args: BeforeOpenCloseMenuEventArgs) => {
            document.getElementById('ddBtn').ej2_instances[0].cssClass = 'e-caret-up';
        }
    }
}
</script>

<style>
  @import '../node_modules/@syncfusion/ej2-base/styles/material.css';
  @import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
  @import "../node_modules/@syncfusion/ej2-popups/styles/material.css";
  @import "../node_modules/@syncfusion/ej2-splitbuttons/styles/material.css";
    .e-caret {
        transform: rotate(0deg);
        transition: transform 200ms ease-in-out;
    }

    .e-caret-up .e-caret {
        transform: rotate(180deg);
    }
</style>
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