Doorbell 4 changing power modes?

When I initially setup my doorbell it asked if I had external power. I selected No since at the time the transformer wasn't of a correct voltage. Now I've gotten the external power and I'm wiring it in but I cannot find anywhere in the app to go change the doorbells settings back to use external power. I was unable to find any reference to it here by searching for external power, power setting, or change or the like so I'm sorry if it's covered but my search foo is failing me. thank you