[EvilOverlord]

Going outside being a very rare thing, might even be illegal depending on the story.

Asimov's The Caves Of Steel and The Naked Sun covered some of that territory. Humanity lived in crowded megacities, always crowded and always indoors. No one ever saw the sun. The protagonist shook in fear, as in a phobia, when he had to step outdoors.

They were written as detective stories, but explored the consequencies of living in such crowded circumstances. The planet Solaria (one of the 50 human colonized planets) in the second book explored the consequences of people living in extremely isolated circumstances.

[GeronL]

interesting

More books to look up and put on the long long list