Default State

The RadioGroup enables you to set its initial value when used in uncontrolled mode.

Use its defaultValue property.

import * as React from 'react';
import * as ReactDOM from 'react-dom';

import { RadioGroup } from '@progress/kendo-react-inputs';

const data = [
    { label: 'Female', value: 'female' },
    { label: 'Male', value: 'male' },
    { label: 'Other', value: 'other' },
];

const App = () => {
    return <RadioGroup defaultValue={data[2].value} data={data} />
}

ReactDOM.render(
    <App />,
    document.querySelector('my-app')
);