Maintenance mode comes in handy during times when you need to work on your WordPress website for a longer period. Switching to a new theme, redesigning your site with a page builder, fixing errors, and testing new plugins are all situations where maintenance mode is beneficial.
These changes can make your website look chaotic temporarily, so it’s better to make it unavailable while you work on it. It’s also important in preserving your SEO rankings by preventing search engines from indexing your incomplete changes.