'{key}' is not a configuration key this grid recognises, so it had no effect on {column|column group} "{name}". Check the spelling against the reference.

Warnings reference › *.unknown:*

Identifier

*.unknown:*

Raised by

The grid (core)

Since

1.56.0

What happened

A column or column-group definition carries a key the model does not read. It is ignored - nothing is renamed or guessed - so whatever it was meant to configure is simply not configured. The key is reported once per unknown *key*, not once per column, so forty columns carrying the same typo produce one line.

The fix

Check the spelling against the column reference. The key is dropped entirely, so a mis-spelt width leaves the column at its default width rather than at the value you wrote.

Reference

Covered in full at the API reference.