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it can be used to redirect the power source. the power (battery) arrives at the center pin and can be redirected to a consumer on the left pin or on the right pin. in my case the pi is connected to the right pin and the left pin is free.
so if I slide the switch to the right, the center and the right pin are connected -> pi boots.
If I slide the switch to the left, the center and the left pin are connected -> nothing happens.
Left = off.
Right = on.

Of course you can use any other switch. With that less current (max. 1,9A) it doesn't matter.