The library folder will now remain visible in your Mac's directory structure, even after a restart, until you uncheck the view option described above.
Hold down the Option key to reveal the Library folder option in the dropdown menu.Select Go from the menu bar at the top of the screen.However, the hidden user library we want to reveal for troubleshooting purposes can be found at Macintosh HD/Users//Library. Then there's the Library folder in System, which contains the main macOS system files. The library folder in the root directory of your system drive (usually called Macintosh HD) contains data accessible to all users, but only administrators have write access to the files. There are actually three library folders on a Mac.
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Read on to find out how to reveal it on your Mac. However, sometimes troubleshooting solutions require that you have access to the library folder. Making haphazard changes to the library folder can cause damage to your system, which is why Apple hides the folder by default. If you have a look in /Library/Caches you will find a bunch of applications have a cache in. The caches in /System/Library/Caches are generally small and useful, the ones in /Library/Caches are less system caches and much more readily cleared. In macOS, the library folder is used to store user account settings, preference files, app support files, caches, and other important data that allows your Mac to function as it should. It's generally safe, though a little dangerous depending, to do it but often not worth the effort.