You circuit diagram will basically visualize circuits as lines and the added symbols will indicate where switches and fusers may go. Depending on how you prefer to work, you may want to set some defaults for your entire diagram. These settings are conveniently located at the bottom of your SmartPanel. The scale is set by default as 1/8, as in one inch on the screen will represent 8 feet. You can customize the scale or change it to metric before you start.
The line settings will help you draw your circuits. If the Allow Lines to Link option is selected in the SmartPanel, the lines will neatly snap to each other. If the Allow Lines to Join option is selected, these connected lines will stay together once connected. Having Use Snaps selected will help lines and symbols snap to the nearest grid point as you draw.