People forgot. As for how they worked around it in their minds, couldn't tell you, although a lot of the formerly-busy streets that led that way tended to be empty.

[Which was understandably also unsettling.]

I'm more unsettled by thinking about what became of the people who were just there when it Inverted. The reports we eventually got back from the people who were able to get inside make Mementos look like a great place to leave your children unsupervised for an afternoon.