Encrypting Apps
Use App Lock to encrypt apps and prevent unauthorized access.
1. Open 
Phone Manager.
2. Touch App lock. When you access App Lock for the first time, follow the onscreen instructions to set a four-digit PIN and password reminder.
3. Turn on the switch next to the apps that you want to encrypt. You will need to enter the PIN each time you open an encrypted app.
On the App Lock screen, touch 
to change password or disable App Lock.
Questions about your Huawei Mate 10? Post in the comments!
Huawei Mate 10 Manual [PDF]