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F2 -> Display options -> [x] Display threads in a different color

That was it. Thanks.

Very old htop versions do not distinguish threads by color.

You can delete ~/.config/htop/htoprc to reset it to default settings in case it's a misconfiguration.

It's the same for me on macOS (htop version 3.0.2). Threads aren't displayed with a different color and I also can't hide them.

Does htop on macOS even show threads?

I thought I was the only one who had never seen green threads.

You should try Go.