How can I change the system in one voice (Piano)

Sorry I just have currently no Idea how to do that, nor where to find in the Dorico help, the description how to do, while I am sure it is presumably possible:
How can I change in pianonotation the System with one voice like that:

Thank you for every helping hint.

This is called cross-staff beaming: take a look here.

Wow that was fast !
Thank you very much!