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(2 edits)

For zoom and navigation: once you generated a map you like you can choose to export it into a *.svg-file. That's a vector graphic format, which allows unlimited "zoom" without losing quality. Inkscape is a nice (free!) program to open and work with *.svg-files.

For the size - keep repeating the generate-process. The produced settlements vary in size even within "large", "medium", and "small" towns. Plus: play around with the option of shanty towns on/off.