wordpress custom post type without block editor code example

Example: remove gutenberg cpt

add_filter( 'use_block_editor_for_post_type', 'prefix_disable_gutenberg', 10, 2 );
	function prefix_disable_gutenberg( $current_status, $post_type ) {
		// Use your post type key instead of 'page or post'
		if ( in_array( $post_type, array( 'page', 'post' ) ) ) {
			return false;
		}
		return $current_status;
	}