Yes, it seems the Stair Tool does not have a separate checkbox to control it.
It is controlled by the checkbox of the Object Tools since a Stair is a type of GDL Object.
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Ahh, Ok,
Thanks Laszlonagy. I knew I hid Stair in some occasion before.
Thanks! Anyway would be handy sometimes to have a separate checkbox for stairs, I'll need to hide them by layer in this case.