How to Hide Captain Widgets Kit Admin Menus

function plt_hide_captain_widgets_kit_menus() {
	//Hide "Captain Widgets Kit".
	remove_menu_page('captain-widgets-kit');
	//Hide "Captain Widgets Kit → Dashboard".
	remove_submenu_page('captain-widgets-kit', 'captain-widgets-kit');
	//Hide "Captain Widgets Kit → Extensions".
	remove_submenu_page('captain-widgets-kit', 'admin.php?page=captain-widgets-kit#/extensions');
	//Hide "Captain Widgets Kit → Settings".
	remove_submenu_page('captain-widgets-kit', 'admin.php?page=captain-widgets-kit#/settings');
	//Hide "Captain Widgets Kit → Help & Support".
	remove_submenu_page('captain-widgets-kit', 'admin.php?page=captain-widgets-kit#/help');
	//Hide "Captain Widgets Kit → Pro Features".
	remove_submenu_page('captain-widgets-kit', 'admin.php?page=captain-widgets-kit#/pro_features');
}

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