If you want to show all files in your folder in Mac OS. You can use a special keyboard shortcut to view all invisible items on your Mac. Below are the detailed steps:

1. Activate the Finder application and open the folder that may contain such files.
2. Press the keyboard shortcut Command + Shift + Period (⌘ + Shift + .) simultaneously.
3. Then you will see all the files in the folder.
4. If you wish to hide the files again, simply repeat the steps above (⌘ + Shift + .).