Custom Filter to hide events from front end

scratch_54.php

<?php
/*
 * Plugin Name: Quick Event Manager - Hide Events from front end and search
 * Plugin Description: Custom filter to hide events from front end and search
 */
add_filter( 'qem_event_register_event_cpt', function ( $args ) {
	$args['$publicly_queryable']  = false;
	$args['$exclude_from_search'] = true;

	return $args;
} );