You need to configure it via your terminal. This guide will help you to show the hidden files on your Mac:

Show hidden files on Mac:

1. Open Terminal via Finder > Applications > Utilities
2. Type or copy: defaults write com.apple.finder AppleShowAllFiles YES  into your command line interface. 
3. Press return 
4. Close all finder windows and reopen.

You can easily hide this files again by typing defaults write com.apple.finder AppleShowAllFiles NO into your terminal. Don't forget to close all finder windows after you made those changes. Sometimes it also help to restart your Mac.