Covered entry with recessed stairs

[brookesdesign]

I'm trying to recess my stairs into my front covered porch but I'm getting a small strip of subfloor under the wall where my steps start.  I used a wall with an arched doorway to create the arched entrance where my stairs start.  To create the area for the stairs I drew a room divide and called the space for the stairs as open to below.  Is there a setting I'm missing to help clean this up?

[brookesdesign]

I couldn't find any settings that cleaned it up but I tried dragging the bottom of the doorway below the stoop and that fixed it.   I have to turn the casing off but at least the subfloor is gone.

[GeneDavis]

Here's a hint:  "sill"

[ericepv]

Turn off the sill.

[brookesdesign]

My sill is turned off.  It only goes away if I turn the casing off.

[ericepv]

Try selecting the area in question and then check in 'Active Layer Display Options' to see what layer it's in. It would also be helpful if you post your plan.

[SPSEngineering]

Try changing the Riser Surface?