I think it's a bit inconvenient to scroll down every time just to change the odds format, especially when playing on mobile. It's even more frustrating because the setting doesn't save automatically. I also noticed there's no option to set a default odds format in the settings, only a few default currency options are available. Personally, reading any odds format other than Decimal European is confusing for me since I'm not familiar with it, and American odds especially takes more time to understand.
I use to experience this but for some reason seems to have fixed itself and doesn't revert back... Maybe try using the desktop version to make these changes and all should be good

Probably a reason why I also believe that the desktop experience is far much better than the mobile experience, you get less of these hurdles..