How to Hide Hummingbird Admin Menus

function plt_hide_hummingbird_performance_menus() {
	//Hide "Hummingbird".
	remove_menu_page('wphb');
	//Hide "Hummingbird → Dashboard".
	remove_submenu_page('wphb', 'wphb');
	//Hide "Hummingbird → Performance Test".
	remove_submenu_page('wphb', 'wphb-performance');
	//Hide "Hummingbird → Caching".
	remove_submenu_page('wphb', 'wphb-caching');
	//Hide "Hummingbird → Gzip Compression".
	remove_submenu_page('wphb', 'wphb-gzip');
	//Hide "Hummingbird → Asset Optimization".
	remove_submenu_page('wphb', 'wphb-minification');
	//Hide "Hummingbird → Advanced Tools".
	remove_submenu_page('wphb', 'wphb-advanced');
	//Hide "Hummingbird → Uptime".
	remove_submenu_page('wphb', 'wphb-uptime');
	//Hide "Hummingbird → Notifications".
	remove_submenu_page('wphb', 'wphb-notifications');
	//Hide "Hummingbird → Settings".
	remove_submenu_page('wphb', 'wphb-settings');
	//Hide "Hummingbird → Tutorials".
	remove_submenu_page('wphb', 'wphb-tutorials');
	//Hide "Hummingbird → Upgrade for 80% Off!".
	remove_submenu_page('wphb', 'https://wpmudev.com/project/wp-hummingbird/?utm_source=hummingbird&utm_medium=plugin&utm_campaign=hummingbird_submenu_upsell');
}

add_action('admin_menu', 'plt_hide_hummingbird_performance_menus', 11);
Where do I put this code?