Go to Profile => Settings "Cog" => Security.....I closed the Bunq app earlier this evening and later on opened the app - it just opened with my balance on account without any verification whatsoever. If I closed the AIB app, there is no way I could go back in without re-entering digits etc. But Bunq just re-appeared with my balance on account without reentering any information.
You can select how long Auto logout should take. I have mine set at 5 minutes for convenience, but you can select 0 minutes if you want to be prompted every time.