x3mgroup

This will add site-wide tweaks to the FUNCTIONS.PHP of any wp-theme, and increases the security of a WordPress Site. 
The creation of this plugin was based on Webfactory’s Ninja Security Plugin!
There is no setup or configuration screen on the current version, but it’s easy enough to edit the plugin. Supports WP Multisite installations
These are the tweaks:
Removes WordPress 
META HEADER version info, so hackers can’t find which version of WP is running!
Replaces the login information so hackers will not know if the USERNAME or the PASSWORD was wrong!
Disables the EDITING of Themes and Plugins by NON ADMIN users!
Removes 
WLW (Windows Live Writer) link is present in the header, 
which is only needed if Winodws Live Writer needs to be used!
Please feel free to add your own tweaks. If you do, please be so kind and leave a message at support!

X3M Site-Wide Ninja Tweaks

Thoriq Firdaus

This plugin gives you the ability to manage core WordPress features like Comments, the Block Editor (Gutenberg), Emojis, XML-RPC, Feeds, Updates, Automatic Updates, Cron, Heartbeat, and more. If you don’t need certain features, you can easily toggle them off or customize their behavior.
It also includes additional utility features, like showing your site’s environment type in the admin bar, enabling maintenance or private mode, or using random URLs for media pages, which you can enable or disable as needed.
<h3>Features</h3>
This plugin organizes these settings into sections so you can quickly find and manage what you need:
<h4>General</h4>
Tweak key WordPress features to fit your needs:
<ul>
<li>Block Editor: Prefer the Classic Editor? Disable the Block Editor for all or specific post types.</li>
<li>Block-based Widgets: Turn off the “Block Widgets Editor”.</li>
<li>Comments: Disable comments and remove related elements in the admin area.</li>
<li>Revisions: Disable or limit the number of post revisions to save to improve performance.</li>
<li>Post Embed: Stop other sites from embedding your post content.</li>
<li>Self-ping: Prevent pingbacks to your own site.</li>
<li>Feeds: Disable RSS feeds if you don’t need them.</li>
</ul>
<h4>Admin</h4>
Customize your admin experience:
<ul>
<li>Dashboard Widgets: Remove unwanted or all dashboard widgets.</li>
<li>Footer Text: Get rid of the Thank you for creating with WordPress footer text.</li>
<li>Update Nags: Hide update notices for WordPress, plugins, and themes.</li>
<li>Admin Bar: Remove the admin bar on your site’s front end.</li>
<li>Howdy Text: Replace the Howdy greeting in the admin bar.</li>
<li>Environment Type: Display site’s environment type (e.g. Development, Staging, Production) in the admin bar.</li>
</ul>
<h4>Media</h4>
Adjust media-related settings:
<ul>
<li>Attachment Page: Disable attachment pages or re-enable them on WordPress 6.4+.</li>
<li>Attachment Slug: Use random URLs for media pages to avoid slug conflicts.</li>
<li>Infinite Scroll: Restore infinite scroll in the Media Library.</li>
<li>Big Image Size: Prevent WordPress to scale down big images.</li>
<li>Image Quality: Adjust the quality of uploaded images (JPEG only).</li>
</ul>
<h4>Site</h4>
Control access and assets on your site:
<ul>
<li>Search: Prevent use from using search on your site to find posts, pages, and other content.</li>
<li>Sitemap: Disable built-in XML sitemaps in WordPress.</li>
</ul>
Unload some of the assets that are not always necessary for your site:
<ul>
<li>Emojis: Improve performance by removing emoji scripts and styles.</li>
<li>Script Version: Remove version query strings from scripts and styles URLs.</li>
<li>jQuery Migrate: Disable jQuery Migrate if it’s not needed.</li>
</ul>
Clean-up some unused metadata from your site:
<ul>
<li>RSD Link: Remove the Really Simple Discovery (RSD) tag.</li>
<li>Generator Meta Tag: Remove the WordPress version meta tag.</li>
<li>Shortlink: Remove the shortlink meta tag.</li>
</ul>
<h4>Security</h4>
Improve your site’s security by disabling or limiting access to certain features:
<ul>
<li>File Edit: Disable the built-in file editor for themes and plugins.</li>
<li>XML-RPC: Disable the XML-RPC endpoint.</li>
<li>API Authentication: Require authentication for all REST API requests.</li>
</ul>
Manage passwords policy on the site:
<ul>
<li>Reset Password: Prevent users from resetting their passwords.</li>
<li>Application Passwords: Disable Application Passwords and remove related UI elements.</li>
</ul>
<h4>Advanced</h4>
For advanced users, you may configure these following features, but do it carefully:
<ul>
<li>Mailing: Prevent WordPress to send outgoing mail.</li>
<li>Updates: Enable or disable updates for WordPress, plugins, and themes.</li>
<li>Cron: Disable WP-Cron and use a real cron job.</li>
<li>Heartbeat: Adjust or disable the Heartbeat API to reduce resource usage.</li>
</ul>

Feature Flipper

Disable Comments, Gutenberg, Emojis, and other features you don't need in WordPress

X3M Site-Wide Ninja Tweaks vs Feature Flipper