Adding an alternative branch

Select the ‎Step1‎ step.
Click “SFC Insert Branch Right”.

The ‎Step2‎ step is inserted to the right of the ‎Step1‎ step. The steps are connected as a parallel branch signified by two pairs of double lines.
Select one of the double lines.

The double line is marked red.
Click “SFC Alternative”

The branch is converted into an alternative branch. The double lines change into a single line.

You can click “SFC Parallel” to convert an alternative branch into a parallel branch.