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I don't believe even lounge staff have this option anymore, with the advent of the Altea system two or three years ago. The duty supervisor and probably even CL staff might have the option but I've been told more than once that lowly lounge staff can't.
International F lounge?
If you're on an emptyish flight, and ask nicely, would the checkin/lounge staff be nice enough to block out the seat(s) next to you?