So this has been fixed but it requires a client update so that means we won’t be able to get the fix to you until 4.5 
it affects any device which uses a 4:3 screen resolution so only tablets.
On Android you can use your device’s back button to go back.
On iPad you must exit the game, thankfully it doesn’t take long to do that and re-enter on iOS although I get that it’s annoying and inconvenient.
I’ll add this to the known issues list.
Sorry everyone.