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That's a rather loaded question. I don't even know which layout you consider "prettiest" yet.

No, you should not hardcode COLUMNS to make select prettier. Doing this may cause inconsistent,...

COLUMNS might be getting set in /etc/profile or ~/.bashrc or something similar.

The output of all of those looks readable, is the thing. Neither too many lines, nor too wide, to be visible. Not 100% consistent when you give it different options and configurations, but that's...

/bin/sh just means "any shell compatible with generic bourne". It could be bash, ksh, or even old-fashioned, honest-to-goodness, written-in-1977 Bourne written by Steven Bourne himself.

So if...

What shell are you using? I know that bash tries to format it elegantly if it can, depending on available space, number of, and size of options.