How do I use the datepicker in React to display numbers on the month selection screen?

import React, {useState} from "react";

import "react-datepicker/dist/react-datepicker.css";
import DatePicker, {registerLocale} from "react-datepicker";
import ja from "date-fns/locale/ja"; // register it with the name you want

registerLocale("ja",ja);

constApp=()=>{
  const [startDate, setStartDate] = useState(newDate());
  return(
    <DatePicker
      locale="ja"
      selected = {startDate}
      onChange={(date)=>setStartDate(date)}
      dateFormat = "yyyy/MM"
      showMonthYearPicker
    />
  );
};

export default App;