Close Submenu when opening another with ReactJS

Creating Submenus I find that when opening one of them all the others open and when closing it in the same way they all close.

This is my code:

const DashBoard = () => {

    const [showDropdown, setShowDropdown] = useState(false)

  return (

    <>
        <div>
            <div>
                <div>
                    <img 
                        src={ Logo }
                        alt= "LOGO"
                    />
                    </div>
                    <div>
                        <ul>
                            <li>
                                <div
                                onClick={ () => setShowDropdown(!showDropdown) }
                                >
                                    <FiHome  />
                                    Submenu 1
                                </div>

                                { showDropdown && 
                                
                                    (

                                    <div>
                                    
                                        <ul>
                                            <li>Test</li>
                                            <li >Test</li>
                                        </ul>

                                    </div>
                                    )                        
                                }
                            </li>
                        </ul>
                    </div>

                    <div>
                        <ul>
                            <li className='group'>
                                <div
                                onClick={ () => setShowDropdown(!showDropdown) }
                                >
                                    <FiHome  />
                                    Submenu 2
                                </div>

                                { showDropdown &&                                
                                    (

                                        <div>
                                        
                                            <ul>
                                                <li>Test</li>
                                                <li >Test</li>
                                            </ul>

                                        </div>
                                    )    
                                }
                            </li>
                        </ul>
                    </div>
            </div>
            <div>
                <main>Main Content</main>
            </div>
        </div>
    </>


  )
}

How could I achieve that when opening a submenu the others are closed? I have reviewed that indicating an ID per submenu is possible but I don’t know if it is the best way. Thanks.