Note that the other problem (hiding one field makes next field not filterable) is because hiding that field makes the "data" field into the "treeField" (see TreeGrid docs on this) which is not filterable by default.
Thank you, I didn't know that. I can't find this in the docs, I mean information about default filtering of treeField. Anyway, if I set canFilter explicitly to true, filter editor becomes visible.
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