A Scene is a group of multiple products, performing specific actions (turning on, turning off, etc.). They can be a combination of iDevices products and other HomeKit™ compatible products. Scenes are not currently available on Android™.
You can ask Siri® to activate the Scene, or you can assign a Schedule to the Scene if you have an Apple Home Hub. The Scene will be activated when the phone is on the same Wi-Fi® network as the product, or if you have a Home Hub setup, the Scene can be activated remotely. An Apple Home Hub can be an Apple TV 4K, Apple TV 4th Generation or iPad® running iOS 10 and later. For more information on using a Home Hub, Click Here
Follow the steps below to edit or delete a scene:
1. From the home dashboard, tap "Scenes."
2. On iOS 11 and Later, press firmly on the scene you would like to edit. On iOS 10, hold your finger on the scene for several moments. The scene details will appear, tap “Edit” on the top right-hand corner
3. To edit the scene, tap “Actions,” select each product and choose what the accessory should do in this scene. To save your adjustments, tap “Done” in the upper right corner.
4. To delete the scene, tap “Delete Scene” at the bottom of the screen.