The Sunshine Bee-Safe Screen options are there to suit your bees and your hive configuration.  If the entrance on your hive is established on the left side of the hive then you need to order a Sunshine Left Side Entrance Screen

If the entrance on your hive is established on the right side of the hive then you need to order a Bee-Safe Right Side Entrance Screen

If you have a hive without a landing board then order the "no landing" board screen.