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For those that might also be curious, my SciTE has a "View->Toggle all folds" menu item, and Boa does not.
discusses behavior that also carries over into Boa:
Ctrl+Shift+Click in the fold margin will expand or contract all the top
Ctrl+Click on a fold point to toggle it and perform the same
operation on all children.
Shift+Click on a fold point to show all children.