Trapcode Form - obscuration layer option missing

I am creating a project using Red Giant Trapcode Form. I need to set an obscuration layer in order for the particles to interact with another 3D layer in the same Z space. However, when I toggle down the visibility options, there is nowhere to set the obscuration layer. I have spent ages searching the internet for answers, and have also tried installing older version of AE to see if that works instead but so far no luck. Please could someone help?

I have attached a screenshot of the options that I get under visibility, and a screenshot of the options that I believe should be there (including the obscuration layer option) I also appear to be missing the Z buffer option

I hope there is a simple solution, grateful for any suggestions