Collapse table groups by default

Seen a few threads about this without answer, also found this message:
Grouping data in a table
we have already implemented this ready for v3
specifically in a thread about table grouping.

I'm in v3 but can't seem to find any documentation or function to collapse table groups by default?

Is there a workaround to this at all?
Or is there a way to collapse all groups?
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