From Manual:
"If you check the "Use continuous scaling" box, then rather than just specifying a zoom level for the whole walkable area, you specify a min and max zoom level."
Where is the box
I can't find the darn thing ???
Never mind I found it in the walkable area section
This might be better clarified ;)
If you are reading about room settings, you should be looking at the 'room options' pane, so reading the manual would be helpful to you.