Apologies! Missed the critical part of your original post - i.e. your question was specifically in relation the the FR Sport model.
it‘s always worth having a look on Seat’s website at the nearly new Arona’s as there’s (usually) a good selection of interior and exterior pictures of cars that are for sale. You can filter the search results using the advanced search criteria so you get to see just Arona FR Sport models.
I‘ve just had a quick look. Here’s the interior of a facelift FR Sport from the Used Cars section of Seat’s website and that car has a blank rather than the button to manually switch off / on the parking sensors. Screenshot below;