Use built-in app lock or screen pinning in your phone settings
Set a strong device passcode, PIN, pattern, or biometric lock
Use a third-party app locker from the app store
Enable app-specific locks in apps that support them
Use parental control or device management features to restrict access
Hide sensitive apps in a secure folder if your device supports it
Turn on two-factor authentication for apps with account access
Keep your operating system and apps updated
Review app permissions and limit access to sensitive data
Log out of apps you do not want others to open