Disable wordpress editor - gutenberg on Post type post

1. Add the following code to your theme's functions.php file to disable Gutenberg on the "post" post type:

add_filter('use_block_editor_for_post_type', 'disable_gutenberg_editor');
function disable_gutenberg_editor($use_block_editor, $post_type) {
    if ($post_type === 'post') {
        return false;
    }
    return $use_block_editor;
}

1. Save the functions.php file.

This code snippet will instruct WordPress to disable the Gutenberg editor specifically for the "post" post type.