When tracing rooms you may find that rooms above/below are displayed, even though 'Show Floor Only' has been selected.
The reason for this is that when you trace a room the software runs through the entire model to check for adjacencies.
Should any rooms above or below be found to have adjacent surfaces, then these rooms will be automatically be shown.
In the below example, the lower room is displayed due to the adjacent surfaces, as highlighted:
If you wish to then hide these you would just need to then right click on the floor and select 'Show Floor Only' once more.