Yslo

WordPress, by default, allows you the ability edit theme and plugin files directly from within the WordPress control panel.
If you never change files directly on your WordPress site, there’s absolutely no need to have this feature available to you or your administrators.
<h4>Features</h4>
<ul>
<li>Disable WordPress Theme/Plugin Editor</li>
</ul>

WP Theme Plugin Editor Disable

This plugin disable Wordpress Theme/Plugin Editor.

Ciprian Craciun

This plugin disable plugins, themes and core updates for WordPress and also the notifications.
It’s very important that you keep your WordPress theme, core and plugins up to date. If you don’t, your blog or website could 
be susceptible to security vulnerabilities or performance issues.
If you use this plugin, make sure you keep yourself up to date with new releases of your active WordPress version, plugins 
and themes and update them as new versions are released (simply by deactivating this plugin for a short time).

Disable Plugins, Themes and Core Updates

This plugin disable plugins, themes and core updates for WordPress and also the notifications.

WP Theme Plugin Editor Disable vs Disable Plugins, Themes and Core Updates