One more try :-)

Switch node:
The Output is connected to either the top input, or else the bottom input, depending upon:

Switch mode:
Left click toggles between top input and bottom input.

Changing to Button mode, in info window, connects the top input.

Button mode:
The pre-existing connection is with the top input.
Left click with HOLD, connects the bottom input, until hold is released. Then the top input is re-connected.

- Brian

Pilou, you are doing an excellent job!