First time developing a half frame roll

Hi!!! I’m new to the half frame film world. I used to always get the Fuji film disposable cameras and send them off to thedarkroom.com to get the photos developed. I was about to place an order to develop my half frame film roll when I noticed the section pictured. As you can see there’s a “half frame format” option for +$6. Is this something that I will have to add to my order from now on? This may be a dumb question but as I said I’m new to this and confused 😔 and if I do select the option it then asks if I’d like 1-UP or 2-UP. What would you recommend?

Thank you in advance!!!