The rowHeaderColumnsMode property (string) specifies the format used for row header columns data.
The "Legacy" mode uses a different data format for specifying multiple columns when rowHeaderColumns are specified:
The "Tabular" mode loads the data from custom resources[] item properties that are defined using rowHeaderColumns. See an example in the row header columns documentation.
"Tabular"
Applicable since 2019.4.4064.
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