Hiding default editor (Gutenberg or not)

Hello Chris,

You can use this PHP code to remove the editor if you want

// Remove the editor. Change 'post' to your custom post type.
add_action( 'init', function () {
    remove_post_type_support( 'post', 'editor' );
} );

Read more on the documentation https://docs.metabox.io/save-wysiwyg-content-post-content/

You can use this PHP code to get the post ID and create a condition to check it before removing the editor.

$post_id = null;
if ( isset( $_GET['post'] ) ) {
    $post_id = intval( $_GET['post'] );
} elseif ( isset( $_POST['post_ID'] ) ) {
    $post_id = intval( $_POST['post_ID'] );
}

the correct code will look like

// Remove the editor for a specific post. Change 'post' to your custom post type.
add_action( 'init', function () {
    $post_id = null;
    if ( isset( $_GET['post'] ) ) {
        $post_id = intval( $_GET['post'] );
    } elseif ( isset( $_POST['post_ID'] ) ) {
        $post_id = intval( $_POST['post_ID'] );
    }
    if( $post_id == 1 ) {
        remove_post_type_support( 'post', 'editor' );    
    }
} );