I have discovered a way to force Monzo to require a fingerprint before you open the app, making for a really nice temporary workaround to give your Monzo account some basic security, stopping random people on your phone from opening it
Before I start, please note that this only works on Oxygen OS, which is OnePlus exclusive
So to do this, you need to open settings. Then, you need to scroll down and find “Security and Fingerprint”. Open it, and find “App locker”. You’ll then be prompted to enter your phone’s pin number, security code or whatever you use to unlock your phone. Once done, you’ll see a list of all your apps; tap the little toggle next to Monzo, and every time you open the app you’ll be presented with this:
Hope this helps!