That’s mostly in Paris. Don’t think I’ve seen that elsewhere.

Paris is the most dense I've seen personally but cafes in Vienna and Zurich at least still face the street at two person tables outside.

Netherlands and Belgium do it too.

Barcelona too.

Really? I’ve been there many times and have never noticed. Maybe it’s a newer trend?

It's not a new trend. People in latin countries like to look at what is happening on the street. https://www.alamy.com/stock-photo/paris-cafe-1950s.html

You have the right username to know Paris ;-) I can't remember from my own visits to Barcelona and Belgium how common it is. But photos of 1950s Paris are not evidence that it's common in other cities now.

I’ve lived all over the place in France and also in London and I’ve only seen this in Paris.

Italy.

NYC here. One of the quaintest things I have seen in my life : A small pub had three tables, two chairs each, on the pavement. One of it was "cordoned" off with velvet-red ropes and for full bottle service, the pub staff open the ropes with great aplomb! Roadside-Royalty.