HIDE Wordpress Gutenberg NO PLUGIN
GITHUB REPOS:
https://github.com/machieajones If you're looking to hide the Gutenberg editor on a Wordpress installation and you don't want to install another unnecessary plugin, that's all you need to do is:
1. Navigate to your theme's functions.php file
2. Add: add_filter( 'use_block_editor_for_post', '__return_false' );