The chair in question is a single futon with a wooden frame and broad arms. It matches the couch and it should be downstairs to make more room for organizing upstairs. I’ve been putting off moving it from upstairs because I wanted to do it when another adult was in the house, in case I fell or got it stuck half-way. (It can unfold awkwardly.) But I never feel like it then, so I went ahead anyway. It looks fine in its new location and the cats like it.
The next step is to move some filing cabinets.