The steps to replace the background image of the Mac login interface are as follows: 1. Confirm the macOS version, which is suitable for Mojave and earlier versions; 2. Prepare the PNG format picture and back up the DefaultDesktop.jpg file under /System/Library/CoreServices/; 3. Replace it with a custom picture and restart it to take effect. ?? Catalina and subsequent versions need to turn off SIP and mount the system disk to a writable state. To hide the user list, restart in the terminal after executing the sudo defaults write /Library/Preferences/com.apple.loginwindow SHOWOTHERUSERS_MANAGED -bool FALSE command. Other settings include enabling automatic login, switching languages and managing multi-user styles, all of which can be completed through system preference settings. Be careful when operating, especially when modifying system files.

Changing the Mac login interface is actually not difficult, but many people are prone to getting stuck when they first operate it. The key is to figure out which macOS version you are using, because the settings of different versions are slightly different. If you just want to change the background image or adjust the user list display, the following methods should help you solve it.

How to change the background image of the login interface

macOS does not directly provide the "change wallpaper" button, but you can do it by replacing the system files. This method is suitable for Mojave and earlier versions, and in Catalina and later versions, the operation will be a little more troublesome due to system partition separation.

1. Prepare a picture you like, it is recommended to use PNG format, the size should be the same as your screen resolution.
2. Open Finder and go to /System/Library/CoreServices/ .
3. Find a file named DefaultDesktop.jpg or similar (which may vary slightly depending on your system version), and back it up.
4. Replace this file with the pictures you have prepared, remember to have the same format.
5. You can see the effect after restarting the computer.

?? Note: In Catalina and later versions, the system disk is read-only. You need to turn off SIP (System Integrity Protection) and mount the system disk to a writable state before replacing it.

How to hide the user list of login interface

If you don't want others to see which accounts you have on your computer, you can close the user list on the login interface, so that only the user name input box will be displayed every time you start the computer, and all accounts will not be listed.

The operation steps are as follows:

• Open Terminal.
• Enter the following command and press Enter:

   sudo defaults write /Library/Preferences/com.apple.loginwindow SHOWOTHERUSERS_MANAGED -bool FALSE

• Then restart the computer and take effect.

After doing this, others can only manually enter the username to log in. Suitable for use in multi-user equipment or office scenarios.

Other related settings tips

Sometimes you may want to make some other adjustments, such as automatically logging in to a certain user, or changing the language of the login interface. All of these can be done in system preferences.

• Automatic login : Go to "System Preferences" → "Users and Groups" → Click the lower left corner to unlock → select the "Auto Login" option.
• Change language : Click the language icon in the lower right corner of the login interface to select a different locale.
• Switch user style : If you are a computer shared by your home, you can enable "Network Account Server" in "Users and Groups" to manage multiple users.

Although these settings do not affect the beauty, they are helpful for daily usage experience, especially when multiple people share a computer at home.

Basically these methods are all. Although they are not particularly complicated, you have to be careful when operating every step, especially modifying the system file. If you are not careful, it may lead to system instability. If you are not sure what you are doing, it is recommended to check the specific restrictions of the current system before taking action.

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