I recently wanted to add a device to an area and it took me a really long time to figure it out.
Initially I went to the already existing area, but there are no “Add Device” or “Add Entity” options I could find.
Then I went to the device screen which looks like in the picture below.
It turns you you have to use the pencil icon in the top right corner to assign the device to an area.
To me the pencil icon looked like “Edit name” since it is placed on the name line, so it did not occur to me that I should use that to edit the device. Maybe having a three-vertical-dots menu with “Edit name” and “Assign area” commands would have been clearer?
Maybe the main takeaway is that for me assigning a device to an area to me does not feel like editing a device, but more like editing an area as the device does not change, but the area (if that makes sense).