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macOS User Guide
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Welcome
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Change System Preferences
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Change your desktop picture
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Add your email and other accounts
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Use a screen saver
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Change the picture for you or others in apps
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Set up other users on your Mac
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Set up Screen Time for yourself
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Change the system language
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Make it easier to see what’s on the screen
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Use accessibility features
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Run Windows on your Mac
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Use Continuity across your devices
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Stream audio and video with AirPlay
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Use your iPad as a second display
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Hand off between devices
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Insert photos and documents from iPhone or iPad
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Insert sketches from iPhone or iPad
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Copy and paste between devices
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Use Apple Watch to unlock your Mac
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Make and receive phone calls on your Mac
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Control accessories in your home
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Send files between devices with AirDrop
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Use AirPods with your Mac
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Manage cookies and other website data in Safari
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Use Private Browsing in Safari
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View privacy reports in Safari
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Understand passwords
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Reset your Mac login password
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Use keychains to store passwords
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Set up your Mac to be secure
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Guard your privacy
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Use Sign in with Apple for apps and websites
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Protect your Mac from malware
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Control access to your camera
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Find a missing device
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Resources for your Mac
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Resources for your Apple devices
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Copyright

Lock a document on Mac
To protect documents from being accidentally changed or deleted, you can lock them. When a document is locked, you receive a warning when you move it to the Trash. When you empty the Trash, the locked document is deleted.
On your Mac, do one of the following:
Lock a closed document: Select it, choose File > Get Info, then select Locked.
Lock an open document: Hold the pointer to the right of the document title, click the down arrow
, then select Locked.
To unlock a document, deselect Locked.
To protect folders and disks, change permissions for them.
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