I don't believe they ever do pre-order.

Here's a menu from July 2023.

Menu offering choice of beef or chicken for main dish

I've tried the Kosher meal and the Fruit Plate in Saga class. Since I don't eat pork or shellfish, I was concerned about regular menu items being appropriate for me. I was glad for my Kosher meal (and it was a pretty good version of that special meal), but I wouldn't have gone hungry if I had rolled the dice. I think I would've missed out on both appetizers, but didn't get a menu photo from my return flight to confirm that.

I commented recently in another thread where the OP showed a photo of a Gluten Free meal on FI.

There isn't a ton of online content regarding FI meals. If you order a special meal, make sure you come back and post to help fill that gap.