Drag the new symbol where it needs to be.
Once the new symbol is dropped, a selection of categories will pop up.
The available symbols in the category will then appear.
And that's it !
Please note the Participant and Lane containers have automatically adjusted to the new size of the process.
When introducing a new lane in a participant it will automatically adjust to have both lanes.
Please note the simulation results are the same no matter how many cores are configured.