Most of it is the setup I've used with the 2-channel OPA1678, but moved over to the OPA1679.
Following the information in this link, I tied the positive inputs of the spare channels (C and D) to the reference voltage (5V) and connected the negative inputs to their respective outputs.
The input voltage range for the OPA167x is 0.5V above the negative rail and 2V below the positive rail, so it's a bad idea to connect the input to 0V, or 5V. I recommend connecting it to half the power supply voltage, which can be found on R18.
And I repeat: please learn how to use that CAD package to use the standard op-amp symbol, I showed in m previous schematic. Any decent program allows op-amps to be drawn as a triangle, with the appropriate pins for the IC you're using. You might be able to find a specific library, or modify an existing one.