@Wayne-TP I'm on version 3.7.106 I'm sure. I've updated as much as it would let me. It seems to be the case only when the app icons are set to large but when set to small it stays white (on my device at least).

  @Wayne-TP That storage scenario is strange. I have plenty of storage, more than half of what my phone has. I'm currently on the iPhone 14 Pro, if you know anyone that has this device to try. I've just deleted and reinstalled the app and rebooted my phone but the app still doesn't switch to dark mode when the icons are set to small — it retains the white background and only dims slightly. Is there a way I can attach a screen recording to show you what's happening? It only happens with the Tapo app so that's why I thought it was more likely to be an app issue rather than a system one but it could be a system issue. It's strange that it's the only app affected on my device. Just for clarification, I'm going to my Home Screen, long pressing until "edit" comes up at the top left, pressing "customise" and then selecting "small" icons and then switching to dark. If I click "large" icons then select dark it changes successfully to a dark background.

Thanks.

  @MMBaz Same thing for me. I noticed on my iPad that the tapo app now has a dark icon, but not on my iphone