I think your T would be fine with it if your brought it up. I had it going the other way once. My T had spent time the previous session leaning forward and it had really wigged me out because it felt like her body was like a finger and it was being shook at me. (I don't know if that makes any sense). I told her the next session that I was wigged out by it and since then she has always sat back in her chair to give me my space. I think Ts are really aware of space and how much different clients need. Part of how we communicate is how much space is between us. I think your T would be open to hearing your needs about space and helping you get those needs met.