Rajan In the Security settings (Profile > Settings > Security & Settings). Make sure to also change the Auto logout time. By default, you only have to login again in to the app once a week. You can bring this value down if you want.
But if your phone is also, for example, protected using a fingerprint, it doesn't make much sense to protect the bunq app with the same fingerprint. You could disable the Biometric login and only login using your security code, which would add a second layer of protection. But in my opinion, the security of your phone is more important than the security of the bunq app on that phone.
