App.jsx

import React from 'react'
import Button from '@material-ui/core/Button'
import Menu from '@material-ui/core/Menu'
import MenuItem from '@material-ui/core/MenuItem'
import './styles.css'

const items = [
  { to: '/home', label: 'Home' },
  { to: '/blog', label: 'Blog' },
  { to: '/about', label: 'About' },
  { to: '/contact', label: 'Contact' },
  {
    to: '/help-center',
    label: 'Help Center',
    items: [
      { to: '/privacy-policy', label: 'Privacy Policy' },
      { to: '/tos', label: 'Terms of Service' },
      { to: '/partners', label: 'Partners' },
      {
        to: '/faq',
        label: 'FAQ',
        items: [
          { to: '/faq/newsletter', label: 'Newsletter FAQs' },
          { to: '/faq/career', label: 'Employment/Career FAQs' },
        ],
      },
    ],
  },
]

const MyMenu = React.forwardRef(
  ({ items, anchorEl: anchorElProp, createOnClick, onClose }, ref) => {
    const [anchorEl, setAnchorEl] = React.useState(null)
    return (
      <Menu
        ref={ref}
        open={Boolean(anchorElProp)}
        onClose={onClose}
        anchorEl={anchorElProp}
        anchorOrigin={{ vertical: 'top', horizontal: 'right' }}
        transformOrigin={{ vertical: 'top', horizontal: 'right' }}
      >
        {items.map((item) => (
          <div key={item.to}>
            <MenuItem onMouseEnter={item.items && createOnClick(setAnchorEl)}>
              {item.label}
            </MenuItem>
            {item.items && (
              <MyMenu
                key={item.to}
                items={item.items}
                anchorEl={anchorEl}
                createOnClick={createOnClick}
                onClose={() => setAnchorEl(null)}
              />
            )}
          </div>
        ))}
      </Menu>
    )
  },
)

function App() {
  const [anchorEl, setAnchorEl] = React.useState(null)
  const createOnClick = (callback) => {
    return (e) => {
      e.persist()
      return callback(e.currentTarget)
    }
  }
  return (
    <div>
      <Button onMouseEnter={createOnClick(setAnchorEl)} variant="outlined">
        View More
      </Button>
      <MyMenu
        items={items}
        anchorEl={anchorEl}
        createOnClick={createOnClick}
        onClose={() => setAnchorEl(null)}
      />
    </div>
  )
}