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Customize the expand and collapse icons

You can customize TreeView expand and collapse icons by using the cssClass property of TreeView. Refer to the sample to customize expand/collapse icons.

Source
Preview
index.tsx
style.css
index.jsx
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import {enableRipple} from '@syncfusion/ej2-base';
enableRipple(true);
import {TreeViewComponent} from '@syncfusion/ej2-react-navigations';

export default class App extends React.Component<{}, {}> {
  // define the array of data
  public hierarchicalData: { [key: string]: Object }[] = [
    { id: '01', name: 'Local Disk (C:)', expanded: true,
        subChild: [
            {
                id: '01-01', name: 'Program Files',
                subChild: [
                    { id: '01-01-01', name: '7-Zip' },
                    { id: '01-01-02', name: 'Git' },
                    { id: '01-01-03', name: 'IIS Express' },
                ]
            },
            {
                id: '01-02', name: 'Users', expanded: true,
                subChild: [
                    { id: '01-02-01', name: 'Smith' },
                    { id: '01-02-02', name: 'Public' },
                    { id: '01-02-03', name: 'Admin' },
                ]
            },
            {
                id: '01-03', name: 'Windows',
                subChild: [
                    { id: '01-03-01', name: 'Boot' },
                    { id: '01-03-02', name: 'FileManager' },
                    { id: '01-03-03', name: 'System32' },
                ]
            },
        ]
    },
    {
        id: '02', name: 'Local Disk (D:)',
        subChild: [
            {
                id: '02-01', name: 'Personals',
                subChild: [
                    { id: '02-01-01', name: 'My photo.png' },
                    { id: '02-01-02', name: 'Rental document.docx' },
                    { id: '02-01-03', name: 'Pay slip.pdf' },
                ]
            },
            {
                id: '02-02', name: 'Projects',
                subChild: [
                    { id: '02-02-01', name: 'ASP Application' },
                    { id: '02-02-02', name: 'TypeScript Application' },
                    { id: '02-02-03', name: 'React Application' },
                ]
            },
            {
                id: '02-03', name: 'Office',
                subChild: [
                    { id: '02-03-01', name: 'Work details.docx' },
                    { id: '02-03-02', name: 'Weekly report.docx' },
                    { id: '02-03-03', name: 'Wish list.csv' },
                ]
            },
        ]
    },
    {
        id: '03', name: 'Local Disk (E:)', icon: 'folder',
        subChild: [
            {
                id: '03-01', name: 'Pictures',
                subChild: [
                    { id: '03-01-01', name: 'Wind.jpg' },
                    { id: '03-01-02', name: 'Stone.jpg' },
                    { id: '03-01-03', name: 'Home.jpg' },
                ]
            },
            {
                id: '03-02', name: 'Documents',
                    subChild: [
                    { id: '03-02-01', name: 'Environment Pollution.docx' },
                    { id: '03-02-02', name: 'Global Warming.ppt' },
                    { id: '03-02-03', name: 'Social Network.pdf' },
                ]
            },
            {
                id: '03-03', name: 'Study Materials',
                subChild: [
                    { id: '03-03-01', name: 'UI-Guide.pdf' },
                    { id: '03-03-02', name: 'Tutorials.zip' },
                    { id: '03-03-03', name: 'TypeScript.7z' },
                ]
            },
        ]
    }
];
private fields: object = { dataSource: this.hierarchicalData, id: 'id', text: 'name', child: 'subChild' };
private style: string = 'custom';
  render() {
    return (
        // specifies the tag for render the TreeView component
     <TreeViewComponent fields={this.fields} cssClass={this.style} />
    );
  }
}
ReactDOM.render(<App />, document.getElementById('sample'));
#loader {
    color: #008cff;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}

#treeparent {
    display: block;
    max-width: 350px;
    max-height: 350px;
    margin: auto;
    overflow: auto;
    border: 1px solid #dddddd;
    border-radius: 3px;
}

.custom .e-list-item .e-icons {
    background-image: url(http://jsplayground.syncfusion.com/13.3.0.7/themes/web/images/ui-icons/ui-icons-default.png);
    background-repeat: no-repeat;
}

.custom .e-list-item .e-icon-expandable,
.custom .e-list-item .e-icon-collapsible {
    background-position: -79px -40px;
}

.custom .e-list-item .e-text-content .e-icon-expandable:before,
.custom .e-list-item .e-text-content .e-icon-collapsible:before {
    content: '';
}
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(true);
import { TreeViewComponent } from '@syncfusion/ej2-react-navigations';
export default class App extends React.Component {
    constructor() {
        super(...arguments);
        // define the array of data
        this.hierarchicalData = [
            { id: '01', name: 'Local Disk (C:)', expanded: true,
                subChild: [
                    {
                        id: '01-01', name: 'Program Files',
                        subChild: [
                            { id: '01-01-01', name: '7-Zip' },
                            { id: '01-01-02', name: 'Git' },
                            { id: '01-01-03', name: 'IIS Express' },
                        ]
                    },
                    {
                        id: '01-02', name: 'Users', expanded: true,
                        subChild: [
                            { id: '01-02-01', name: 'Smith' },
                            { id: '01-02-02', name: 'Public' },
                            { id: '01-02-03', name: 'Admin' },
                        ]
                    },
                    {
                        id: '01-03', name: 'Windows',
                        subChild: [
                            { id: '01-03-01', name: 'Boot' },
                            { id: '01-03-02', name: 'FileManager' },
                            { id: '01-03-03', name: 'System32' },
                        ]
                    },
                ]
            },
            {
                id: '02', name: 'Local Disk (D:)',
                subChild: [
                    {
                        id: '02-01', name: 'Personals',
                        subChild: [
                            { id: '02-01-01', name: 'My photo.png' },
                            { id: '02-01-02', name: 'Rental document.docx' },
                            { id: '02-01-03', name: 'Pay slip.pdf' },
                        ]
                    },
                    {
                        id: '02-02', name: 'Projects',
                        subChild: [
                            { id: '02-02-01', name: 'ASP Application' },
                            { id: '02-02-02', name: 'TypeScript Application' },
                            { id: '02-02-03', name: 'React Application' },
                        ]
                    },
                    {
                        id: '02-03', name: 'Office',
                        subChild: [
                            { id: '02-03-01', name: 'Work details.docx' },
                            { id: '02-03-02', name: 'Weekly report.docx' },
                            { id: '02-03-03', name: 'Wish list.csv' },
                        ]
                    },
                ]
            },
            {
                id: '03', name: 'Local Disk (E:)', icon: 'folder',
                subChild: [
                    {
                        id: '03-01', name: 'Pictures',
                        subChild: [
                            { id: '03-01-01', name: 'Wind.jpg' },
                            { id: '03-01-02', name: 'Stone.jpg' },
                            { id: '03-01-03', name: 'Home.jpg' },
                        ]
                    },
                    {
                        id: '03-02', name: 'Documents',
                        subChild: [
                            { id: '03-02-01', name: 'Environment Pollution.docx' },
                            { id: '03-02-02', name: 'Global Warming.ppt' },
                            { id: '03-02-03', name: 'Social Network.pdf' },
                        ]
                    },
                    {
                        id: '03-03', name: 'Study Materials',
                        subChild: [
                            { id: '03-03-01', name: 'UI-Guide.pdf' },
                            { id: '03-03-02', name: 'Tutorials.zip' },
                            { id: '03-03-03', name: 'TypeScript.7z' },
                        ]
                    },
                ]
            }
        ];
        this.fields = { dataSource: this.hierarchicalData, id: 'id', text: 'name', child: 'subChild' };
        this.style = 'custom';
    }
    render() {
        return (
        // specifies the tag for render the TreeView component
        <TreeViewComponent fields={this.fields} cssClass={this.style}/>);
    }
}
ReactDOM.render(<App />, document.getElementById('sample'));