How to Hide Screen Sharing System Admin Menus

function plt_hide_screen_sharing_system_menus() {
	//Hide the "Screen Sharing" menu.
	remove_menu_page('screen-sharing-system');
	//Hide the "Screen Sharing → Screen Sharing" menu.
	remove_submenu_page('screen-sharing-system', 'screen-sharing-system');
	//Hide the "Screen Sharing → Settings" menu.
	remove_submenu_page('screen-sharing-system', 'screen-sharing-settings');
}

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

Where do I put this code?