Disable Comments Completely
Turns comments off everywhere: closes comments and pings, hides existing comments, and removes the Comments menu, admin bar item and comment feed links.
Snippet Library
Disable Features snippets for WordPress
Snippets that switch off WordPress features you do not use: comments, the block editor, RSS feeds, automatic updates, attachment pages and more. One snippet per feature, so you turn off exactly what you want and nothing else.
Disable RSS Feeds
Redirects every feed URL to the homepage and removes feed links from the page head. Useful for brochure sites and web apps that do not publish posts.