Supposedly you have to use a pin to do anything anyway unless you just want to view balances.
In public I spin around in a circle when entering my pin so any camera or person trying to get it won't. The only time I use the app in public is to get cash and I usually get the code before I leave the house.
I know you do that for security.
And I'm not saying you're wrong to.
But it's... just amusing to think of someone just spinning randomly in public.