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Of course. Your face or fingerprints (biometrics) are stored on your device, so if you delete them from your device, you can't use them to get into the app in the future.
If you want to disable biometrics in the app altogether, select ‘More’ on the account summary screen and change your settings.
Remember, if anyone else's fingerprint is stored on your device, they'll be able to access the app when you enable biometrics.