Disable dimming on a light group helper?

Configuration
1

I’ve created a light group helper containing 4 lights. The group gives me a dimming slider and color palette, but how can I change change it to just off/on? One of the 4 lights is dimmable, so I’m guessing that’s why it defaulted to this behavior.

2

I figured it out, using the customize feature in configuration.yaml. I’m surprised there’s not an easier way to do this.

homeassistant:
  customize:
    light.outdoor_lights:
      supported_color_modes:
        - onoff