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I had trouble finding documentation, is it possible to collapse/expand the text tree from the keyboard? Are there other keyboard commands?

Yes. Ctrl + spacebar to expand/collapse.

I'm working on getting things updated now. More documentation will be available over the next few weeks.

It might be good to temporarily add a link on the main site for the documentation at https://github.com/calculist/calculist/wiki

Done. Thank you for the suggestion.