Both sides I am afraid. I was on 21 A. My daughter and wide on the two middle seats. And crew did not seem to do much. Only once or twice I saw a passanger walking back to Premium eco cabin as if told off.

To be honest I would avoid these seats at all costs. Not just this but also served meals last..and crew did not seem to proactively offer to serve child meal earlier either. I asked for lunch and they obliged but for dinner I forgot to ask and it felt like forever.

On the positive side it does feel calmer when no foot traffic around from crew or passengers.