CAUTION! I tried that wizard; it is brain-dead! Here is an example: This solution is unusable because with the 1Ω current limiting resistor, the current through the LEDs would increase very rapidly if the supply voltage increased slightly above 12V.
To make the circuit more tolerant of input voltage fluctuations, the voltage drop across the current limiting resistor should be at least 3V, which means it should have a minimum resistance of E/I = 3/0.02 = 150Ω, which means you cannot drive 5 LeDS in-series from 12V. It would take two strings, with three LeDS in one and two in the other.