Hide sensitive apps with private space – Android Help – Google Help

On your Android device, open the Home screen or All Apps. Scroll down to “Private space.” On the right of Private space, tap Lock . Lock automatically through the Settings. On your Android device, open the Home screen or All Apps. Scroll down to “Private space.” Tap Private space. To unlock, authenticate with your private space lock.

https://support.google.com/android/answer/15341885?hl=en