By default, you can’t see many system files, dot files and folders in Finder.

To see,

• Open the Terminal App,
• Go to Applications – Utilities
• Enter in “defaults write com.apple.Finder AppleShowAllFiles YES”
• Restart the Finder App, press option + alt + esc
• Select Finder and Press Force Quit

To hide again, Enter in “defaults write com.apple.Finder AppleShowAllFiles NO”