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Your stair settings has 'Rules' that allow the stair to be flexible as you place it.
You can untick these rules to turn them off and then you can add specific values for going length, riser height, number of treads, etc.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11