How to Hide Error Log Viewer by BestWebSoft Admin Menus

function plt_hide_error_log_viewer_menus() {
	//Hide "Error Log Viewer".
	remove_menu_page('rrrlgvwr.php');
	//Hide "Error Log Viewer → Settings".
	remove_submenu_page('rrrlgvwr.php', 'rrrlgvwr.php');
	//Hide "Error Log Viewer → Log Monitor".
	remove_submenu_page('rrrlgvwr.php', 'rrrlgvwr-monitor.php');
	//Hide "Error Log Viewer → BWS Panel".
	remove_submenu_page('rrrlgvwr.php', 'rrrlgvwr-bws-panel');
}

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

Where do I put this code?