Thanks for the feedback. We haven't changed the default to sats (yet) because a lot of small businesses using our app expect to be able to enter values in their local fiat currency. 

But we have just gone ahead and made the setting persist in your browser local storage now so at least now if you change to sats it will stick with that until you change it back rather than defaulting back to fiat all the time. 

 I think that's a reasonable solution. Although I think a simple toggle in Settings would be preferable. That would be a logical way to give both types of users the ability to configure Coinos, and to make that setting persistent across browsers and devices.