If you have a “device” that uses a lot more energy than the rest of your devices, it shrinks down all the other monitored devices and you aren’t able to see the variations between each day. So if you have an EV added as one of the monitored devices, the bars for all your other devices will get a lot smaller.
It would be nice to be able to add multiple individual devices monitoring cards, or maybe just one for regular devices and one for devices that with higher power usage.