How to Hide MarqueeX – Smooth Marquee Slider, News Ticker & Post Marquee for Block Editor & Elementor Admin Menus

function plt_hide_marqueex_menus() {
	//Hide "MarqueeX".
	remove_menu_page('marqueex');
	//Hide "MarqueeX → MarqueeX".
	remove_submenu_page('marqueex', 'marqueex');
	//Hide "MarqueeX → Settings".
	remove_submenu_page('marqueex', 'marqueex-settings');
	//Hide "MarqueeX → Upgrade".
	remove_submenu_page('marqueex', 'marqueex-pricing');
}

add_action('admin_menu', 'plt_hide_marqueex_menus', 1000000000);

Where do I put this code?