WPMovieLibrary duplicate movie menu fix

functions.php

<?php

function _alx_movie_duplicate_menu_fix( $args, $post_type ) {

	if ( 'movie' != $post_type ) {
		return $args;
	}

	$args['show_in_menu'] = false;

	return $args;
}
add_filter( 'register_post_type_args', '_alx_movie_duplicate_menu_fix', 10, 2 );