When viewing a staircase in 2D plan view you can see a cut line through the staircase. The cut line is a standard drafting symbol for stairs.
You can change the cut line’s position, size, angle and style. You can also hide it from view if you want.
To edit the appearance of the cut line:
Select the staircase.
Right-click and select Properties, or select Edit > Modify Elements > Properties.
In the Stairs/Ramps dialog, select the Details tab.
Edit the settings in the Cut Line area.
Once you’ve defined your cut line, click OK.