Second rinse switch on this machine is definitely a little toggle switch,
It looks like somebody taped over it and left it in the off position to save water, wise thing to do if you want to save energy and water
Over the years, I disconnected the second rent switch on hundreds of washing machines, with the approval of the owner, who was interested in saving water, especially when it was a rental property. It also saves a lot of wear and tear on the washing machine, not having to go through a second full rinse and spin operation.
John