WP Plugin Must-Use Plugins
Must-Use plugins are WP Plugins activated automatically and must single file.
Must-Use plugins folder is in wp-content folder.
if Must-Use plugins is exist you can see it from the Plugins area, see the image

Must-use Plugin WordPress
https://wordpress.org/support/article/must-use-plugins/
10 Related pages
- WordPress Plugin Documentation
 - WP Plugin Admin Main and Sub Menus
 - WP Plugin boilerplate generator
 - WP Plugin enable debug
 - WP Plugin Must-Use Plugins
 - WP Plugin Pluggable Functions
 - WP Plugin prevent direct access to PHP code in WordPress
 - WP Plugin Registration Hooks
 - WP Plugin Secure WordPress Plugins
 - WP Plugin WordPress APIs
 























