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Wiki Tutorial of Freezing Columns
looking for just such a thing right now - can't seem to find anything yet
ok - looks like it's setFixedColumnCount on the behaviors thing:
https://fin-hypergrid.github.io/core/2.1.15/doc/Behavior.html
https://github.com/fin-hypergrid/core/blob/master/src/behaviors/Behavior.js#L916