"Up to level: " is added as a prefix to all Level names in the "Top Constraint" pull-down (for the Wall parameter): 
This is completely unnecessary and takes up space (requiring you to hover over it to see the full name, or widen the properties). It adds no information - we understand that Structural Columns go "Up to..." the Level specified by the "Top Level" property, why does the extra text have to be there for Walls?

And the fact that they're called "Constraint" vs "Level" is fodder for a separate wish...