Why there is no save option for UI settings?

I really disappointed about the fact that I need manually change the UI to the Metric system, from F to C, when I log into Ventusky. First, the app can simply use my location from the profile and know exactly that we DON'T USE imperial here in the EU! Second of all, you CAN SAVE what I chose in the settings for God sake. That's all from my end.

Alex Py
The units are of course saved, and after changing them on device you don’t need to set them again (however, you need to do this on each device). In what situation do they revert back — after closing the app?

Secondly, the units are set according to your language — if your phone is set to English-US, then °F will be used. The units are not set based on your location.