Here's something to think about:
Why do we live in much larger and denser communities now?
For the majority of human existence we've lived in rural communities. What drove the urbanisation of rural populations?
During covid many places saw the reverse, ruralisation of urban populations. In an anarchist utopia that has removed capitalism, do you think people would stick with large dense urban environments or, like during covid, begin to ruralise again?
If you're unsure of what your opinion is on these questions. Somewhere to start could be looking at the Scottish Highland clearances, the Industrial Revolution in the UK, and the textile industry of the British Empire. All are major factors as to why Scotland urbanised. Most countries urbanised for similar reasons, but these examples are very well documented and very overt so make it more clear than many other places do.