Open the Samsung Secure Folder app
Sign in with your Samsung account
Set up a lock method such as PIN, pattern, password, or fingerprint
Open Secure Folder
Tap Add apps
Select the apps you want to lock
Tap Add
Use the apps only from inside Secure Folder
To hide Secure Folder, open Quick Panel
Tap Secure Folder
Tap the settings icon
Turn on Hide Secure Folder
To lock apps with app pinning, open Settings
Tap Biometrics and security
Tap Other security settings
Tap Pin windows
Turn on Pin windows
Open the app you want to lock
Open Recent apps
Tap the app icon
Tap Pin this app
To unlock, enter your PIN, pattern, password, or fingerprint