The Stair page of the Properties contains parameters for defining the size of treads and risers.
Stair shape and Turn type: These vary depending on the type of stair you are creating. These options are explained for each stair type.
Base Width: The width of the stairs. You can define this here, or when defining the stair geometry.
Height: The height of the stairs. You can define this here or when selecting stair by edit tool.
Tread depth: The horizontal depth of each step.
Riser height: The vertical height of each step.
Riser count: The number of stairs. You can define this here, or when defining the stair geometry.
Terminate with: Defines what will appear at the top of the stairs.
Note: Other stair properties, such as tread and riser thickness, nosing length, and materials can be set using the Style Manager. Once you have styles defined, you can set a stair's style in the General page of the Properties.