Yeah, seems like they’d say something. But who knows, maybe you got a clerk that only answers questions that are asked without volunteering any other info.
Another quick tip… depending on how tall the people sleeping on it are, it might be more comfortable if they sleep on it sideways— basically turned 90° from the normal way you’d think to sleep. This only works for people under 60-65” tall.
And going along with that ^, you can get a few extra inches of space by pushing the sofa to a corner. Then, when you remove the seat cushions from couch to pull the bed out, use the cushions to fill in the space between the mattress and the wall. If need be, you can also use rolled up towels or a blanket to fill in the remainder of the gap. That’s where you’ll put the pillows, using the wall as your “headboard”. It gives you another 3-5” depending on how wide the sofa arm is… it’s not a lot, but it could be just enough to keep a kid’s feet from hanging off the edge.