How to Hide the "Endless Posts Navigation" Admin Menu

function plt_hide_endless_posts_navigation_menus() {
	//Hide the "Settings → Endless Posts Navigation" menu.
	remove_submenu_page('options-general.php', 'endless_posts_navigation');
}

add_action('admin_menu', 'plt_hide_endless_posts_navigation_menus', 11);

Where do I put this code?