Change Security & Privacy General preferences on Mac
Use the General pane of Security & Privacy preferences to protect your Mac from malware and tampering.
To open this pane on your Mac, choose Apple menu 
> System Preferences, click Security & Privacy, then click General.
Option | Description |
|---|---|
Change Password | Click to change the login password for the current user. |
Require password... after sleep or screen saver begins | Use this setting to lock your Mac when it’s left in an idle state. When the Mac wakes, a user login password must be entered before the Mac can be used. You can select the amount of time after the screen saver or sleep begins before a password is required. |
Show a message when the screen is locked | Select to display a short message in the login window when your Mac is locked. The message will be shown to any users who attempt to log in. It can also be used to provide contact information for a lost Mac. |
Disable automatic login | Select to require users to authenticate with a password when they log in after restarting the Mac. This feature isn’t available if FileVault is turned on. |
Allow your Apple Watch to unlock apps and your Mac | Use your Apple Watch (instead of entering your password) to unlock apps when they require a password and unlock your Mac when you wake it from an idle state. See Unlock your Mac and approve requests with Apple Watch. This option is available only if your Mac supports Auto Unlock. |
Allow apps downloaded from | You can protect your Mac from malware by only allowing apps that come from the App Store or from identified developers.
|
System software blocked | If you recently installed new software, it may attempt to load system extensions. Click Allow to load system extensions from the developer of the software. |
Lock | Locks or unlocks Security & Privacy preferences. Click the lock icon |
Advanced | Click to increase the security on your Mac by adjusting specific settings in Change Advanced preferences. |
to unlock it, then enter an administrator name and password.