Not specifically a Homekit question, this is more regarding the iOS Home app...
In the iPhone Settings > Control Centre. There is a switch 'Show Home Controls...Include recommended controls for Home Accessories'. When switched on some accessories show on the iPhone Control Centre when swiping from the top of the screen. However they seem to be completely random, not linked to 'Favourites'. Does anyone know if there's a way of linking specific commonly used devices to Control Centre? Mine just brings up 2 smart plugs, a light, a window shade and the garage door. Not much use really.