Since iOS 13 was introduced, it changed the way it displays HomeKit accessories that contain multiple functionalities, including our Outlets, in the Home app.
Follow these instructions to get the old behavior back:
Locate the accessory you want to modify
Tap and hold on the device name
Scroll down or click on the bottom right icon to see the accessories settings
Tap on "Show as Separate Tiles"
This would have to be done to all accessories that have been put in a single tile if you want the old behavior back.