I would suggest editing the wp-config.php
file, and adding:
define('WP_HOME','https://example.com');
define('WP_SITEURL','https://example.com');
However for multisite here it says you should edit DOMAIN_CURRENT_SITE
and PATH_CURRENT_SITE
, if there is such thing defined in a multisite wp-config.
First suggestion is based on this article.