How to Hide WP Help Popup Admin Menus

function plt_hide_wp_help_popup_menus() {
	//Hide "WP Help Popup".
	remove_menu_page('wp_help_overview');
	//Hide "WP Help Popup → WP Help Popup".
	remove_submenu_page('wp_help_overview', 'wp_help_overview');
	//Hide "WP Help Popup → Settings".
	remove_submenu_page('wp_help_overview', 'wp_help_settings');
	//Hide "WP Help Popup → Our Plugins".
	remove_submenu_page('wp_help_overview', 'wp_our_plugins');
	//Hide "WP Help Popup → Upgrade to Pro".
	remove_submenu_page('wp_help_overview', 'https://kninfotech.in/product/wp-help-popup-pro');
}

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

Where do I put this code?