Showing Dimensions
If you're using SmartDraw's wall's tool, the actual length of each wall segment will be displayed above your line as you're drawing.
This will help you draw a more accurate outline on the first try, reducing the amount of time you'll need to spend on editing.
Once your room outline is complete, you can still show the length of each wall segment by selecting all the walls and then choosing Show Dimensions in SmartPanel.
For more control over which objects display dimensions, select an object and click Dimensions in the Shape Properties group of the Design tab. Here, you can set your walls to display its dimensions: "Always," "Only when selected", or "Never." Choose the appropriate option for you.