If enabled, this function protects your wallet by requesting your password, fingerprint, or facial ID each time you try to:
Initiate or sign a transaction
Export the wallet
Access the backup phrase
How to enable spending authentication
Spending authentication must be activated for each wallet separately. To turn on this feature, tap on the 3 dots at the top of the wallet information screen then tap the Request spending authentication toggle.
Read more about the security features of the Bitcoin.com Wallet app here.