Where I went for my third, they'd taken over a small carpark and put up temporary canopies, so the "waiting area" is just a bunch of outside space, chairs, something to keep the rain off. People sit around on their phones, self-timing the wait. Throughput was their constraint, not capacity.
That setup was pretty low risk because it's naturally ventilated (even windy at times) and has lots of capacity because it's just a car park plus some canopies. But obviously in a city centre clinic it may be very hard to do this (my GP† is in the heart of the University where I work, set on the edge of a pleasant grassy leisure area with a stream, the car park is accessed from a service road behind) but I can imagine the city hospital couldn't do likewise, nor could GPs in other inner city areas of my own city.
† General Practitioner, ie the doctor who knows a little about almost everything that can go wrong with humans and works out in the community not at a hospital.
That setup was pretty low risk because it's naturally ventilated (even windy at times) and has lots of capacity because it's just a car park plus some canopies. But obviously in a city centre clinic it may be very hard to do this (my GP† is in the heart of the University where I work, set on the edge of a pleasant grassy leisure area with a stream, the car park is accessed from a service road behind) but I can imagine the city hospital couldn't do likewise, nor could GPs in other inner city areas of my own city.
† General Practitioner, ie the doctor who knows a little about almost everything that can go wrong with humans and works out in the community not at a hospital.