The switch as four wires: one black, one brown, one red, and one green. I know what to do with the black and green wires. My problem is what to do with the brown and red wires. Does one or both of them connect to the white wire?

Got a product number for this switch? Not familiar with the leviton switches that have leads, most have terminals.

Look through this post and also the link to the switches diagram:
https://www.askmehelpdesk.com/electrical-lighting/how-wire-leviton-pr180-24265.html