As an additional security measure, aside from the 2FA, you can also prompt face/fingerprint lock when you open OnePassport App on your phone. When this is enabled, you'll have to use your face or fingerprint to access the app.
Go to More from the menu at the bottom. Select Security Settings.
Toggle on "Enable Face/Fingerprint/Pin Authentication to enable it.
The next time you open OnePassport App, authentication will be required. You can use either Face, Fingerprint or (phone) PIN.
Accessing App using Face
This can only be activated when you have set it from your phone settings.
In the mobile app, just scroll right to select Face. Show your face to the front camera. Follow the prompts.
Accessing App using Fingerprint
This can only be activated when you have also set it already from your phone settings.
In the mobile app, just scroll left to select Fingerprint. Touch the fingerprint sensor to confirm your fingerprint.
In case you are not successful in setting up face or fingerprint beforehand, you can use PIN as a privacy measure when opening your app. Same steps from the above screenshots applies to enable it.